Players and Server admins can now opt-in to the Spring Beta Update. Players can choose to opt-in by seleting the "preview" option from their beta tab for the game in Steam Properties. Admins can opt their servers in by updating with the following command:
app_update 232130 -beta preview

The full changelog is as follows:

Highlights

• 2 New Maps
  
  • Endless Only - DieSector
    
  • Holdout - Power Core
  
  
• New Endless Game Mode
  
  • Patriarch Trader voice for Endless Mode
    
  • Chance for mutated waves (Single Zed, Weekly, and Stand Your Ground waves)
  
  
• 3 New Weapons
  
  • Mac 10 SMG for Firebug and SWAT
    
  • Husk Cannon for Firebug and Demolitionist
    
  • AF 2011-A1 for Gunslinger
  
  
• New Playable Character
  
  • D.A.R.
  
  
• Reworked Zed
  
  • Elite Alpha Clot is now the Rioter
  
  
• Time Limited Spring Objectives, Tickets and Items (event tickets and drops will not be part of the beta)
  
  • Endless Spring Objectives to earn D.A.R. armor and variations
    
  • Cyberpunk Event Tickets
    
  • Cyberpunk Cosmetics
  
  
• Zedconomy
  
  • Assault D.A.R. Bundle
    
  • D.A.R. Cosmetic Crate
    
  • Weapon Collector Crate
  
  
• New Steam Achievements for DieSector, Power Core, and their Collectibles

General

• Added Daily Objectives for D.A.R., Mac 10, Husk Cannon, and AF 2011-A1.
  
• Removed all of the Survival Versus mode Daily Objectives until we have a chance to revisit the mode
  
• Added two new boss music tracks
  
  • Abomination - "Hack Attack" by Rocky Gray
    
  • King Fleshpound - "Spike Grinder" by Rocky Gray
  
  
• Memory improvements on all platforms
  
  • Reduced load times across a variety of hardware on PC
    
  • This should fix several potential lock ups on PlayStation 4 and XboxOne
  
  
• Added the ability for players to vote to skip trader time in the escape menu
  
• Added a confirmation notification message whenever a player selects Basic Training on the Home menu
  
• Added Stand Your Ground objectives to all non-Holdout maps
  
  • There is a 35% chance of a wave having a Stand Your Ground objective
    
  • The 1st and Boss wave will not have a Stand Your Ground objective
    
  • Server admins can turn these off
  
  
• Dosh Vault rewards are now granted for
  
  • Zed and Boss kills
    
  • Stand Your Ground objectives
  
  
• XP rewards are now granted for Stand Your Ground objectives
  
• Improved explosive projectile trajectory for certain weapons so that firing straight up will result in the explosive round eventually falling back down
  
• Added HUD UI for the Command Wheel so that players can see the requests and statements made by other players around the map
  
• Added iconography and color to text in the Trader Pod menu to help players know if their weapons are low on ammo or completely out.

Balance
Zeds

• Elite Alpha Clot is now the Rioter
  
  • Now armored up in the front on his torso and head, aim for his legs or his back to bring him down!
    
  • Rally ability SFX have been changed to fit more aesthetically

Survival Versus

• Lowered the EMP incapacitation resistance of the playable Alpha Clot, Slasher, Stalker, Crawler, Gorefast, Bloat, and Fleshpound to make it easier to induce the EMP effect on them

Perks and Weapons

• .500 Magnum Revolvers
  
  • Damage increased 6.6%
  
  
• 1858 Revolvers
  
  • Damage increased 100%

Bug Fixes
Perks and Weapons

• Fixed a gameplay bug with the Medic perk skill, Acidic Rounds, where it did not deal the correct amount of damage
  
• Fixed a gameplay bug with the Hemogoblin where the Medic perk skill, Acidic Rounds, reduced the damage of the bleed damage over time
  
• Fixed a gameplay bug with the Gunslinger perk skills, Rack `em Up and Bone Breaker, where the damage bonus was not applying in online game sessions
  
• Fixed a gameplay bug with the Medical Syringe where players could use the syringe to heal other players from any distance
  
• Fixed a gameplay bug with the Demolitionist and Support perks where players could swap back and forth between the two perks and grant other players ammo and grenades repeatedly during Trader Time
  
• Fixed a sound bug with the Alpha Clot and Rioter where they would continue making jingle sounds while walking after the Christmas event was over
  
• Fixed a sound bug with the .500 Magnum Revolver where it was missing its hammer sound effect on full reloads
  
• Fixed a sound bug with the Stoner 63A LMG where its melee bash was missing melee sound effects
  
• Fixed an animation bug with the Dual .500 Magnum Revolvers where the hammers did not reset back into their proper positions after an empty reload

Zeds

• Fixed a gameplay bug with the Abomination where players can become stuck in the grab animation while it performs its gorge attack during Zedtime
  
• Fixed a gameplay bug with Abomination where he would sometimes become stuck on his own minions and die immediately from being unable to path successfully to the players
  
• Fixed a model bug with the Abomination where the model was not enlarging upon dealing damage to players on the Beefcake weekly
  
• Fixed a sound bug with the King Fleshpound where its footsteps and noises were displaced after firing its laser

General

• Fixed a gameplay bug with Zed Weeklies, Bobble Zed and Up,Up, and Decay, where some of the zeds had more body and head health than intended
  
• Fixed a gameplay bug with dosh where players spawning into the beginning of the 3rd wave trader time will have 0 starting dosh
  
• Fixed a daily objective bug with the Spitfire pistols where the damage daily objective did not account for the fire damage over time
  
• Fixed a daily objective bug with the M16 M203 where the damage daily objective did not account for the M203 explosive and impact damage from the HE round
  
• Fixed a SFX bug with the playable Survival Versus Scrake Christmas variant where the glow overlay was missing from its model
  
• Fixed a daily objective bug with the Complete Match as PC Rob Briar daily objective where it did not register a completion after completing a Weekly match as PC Rob Briar
  
• Fixed a sound bug with Stand Your Ground where the stinger sound did not play for losing the Stand Your Ground objective

Map

• Fixed a lighting bug in Prison where a light would flicker on and off depending on the player's distance from the light source
  
• Fixed a collision bug in Prison where certain welded doors would break and remain standing in the doorframe, obscuring the vision of players
  
• Fixed a collision bug where a blocking volume in Tragic Kingdom kept players from breaking a collectible inside of a truck
  
• Fixed a SFX bug where the alt-fire of the Freezethrower caused a constant blast and sound effect on the dead elf props located in Krampus Lair
  
• Fixed a spawning bug in Holdout-style maps where the portal entry child spawners were not working
  
• Fixed a collision bug in Krampus Lair where some of the welded, wooden doors in the underground prison would break and remain standing in the doorframe
  
• Fixed a collision bug in ZED Landing where some rocks had FLEX meshes that were not being utilized
  
• Fixed a SFX bug with lava meshes in The Descent where blood and explosion decals could appear on their surface
  
• Fixed a model bug in Nightmare where eyeballs were missing on dedicated servers from the massive flesh mountain creature in the boss arena

UI

• Fixed a UI bug with the Trader Pod menu where the weapons were not being properly sorted from least to most expensive
  
• Fixed a UI bug with the Welder | Vault | Vosh | Precious, Kukri | Vault | Vosh | Precious, and Demo Knife | Vault | Vosh | Precious where they did not have the option to recycle
  
• Fixed a text bug with all dual pistols except the dual 9MM pistols where the description text stated "Each can be individually sold" but they actually could not be individually sold
  
• Fixed a text bug with the Survivalist perk skill ZED-TIME - Lockdown where there were quotation marks at the end of its description
  
• Fixed a text bug with the Masterson | Vault | Camo Blotches | Purple where the text, "Compatible with Lt. Bill Masterson", was missing Classic Masterson
  
• Fixed a text bug with the Trader menu description of the Heckler & Koch UMP where it stated that it has a semi-auto fire mode. Rather, it has a burst fire mode
  
• Fixed a UI bug with the Varmint Rifle where using extra ammo Command perk skills caused an inaccurate display of the total ammo when first entering the Trader Pod menu
  
• Fixed a UI bug with the Matchmaking Squad messaging where "The party host has left." message appeared at incorrect times
  
• Fixed a localization bug with Horzine Supply Emote Series #1 and #2 crates where the description for them was not localized

Cosmetic

• Fixed a cosmetic bug with Oisten Jagerhorn where he could not wear eye patch cosmetics
  
• Fixed a cosmetic bug with the Wasteland suit where backpack cosmetics could not be equipped while having the Wasteland outfit equipped
  
• Fixed a cosmetic bug with the Porcelain Mask | Vault | Broken where it was not able to be equipped on any character
  
• Fixed a cosmetic bug with the Alan | Vault | Camo Blotches | Arctic where it could not be equipped onto Classic Masterson
  
• Fixed a model bug with the C4 where the precious skin texture did not display on thrown C4

Platform Specific Fixes
PC/Steam

• Fixed a code bug with dedicated servers where logs were being generated that consumed a lot of CPU after a period of time
  
• Fixed a code bug with the KFPickupFactory : bEnabledAtStart option in the KF2 SDK where the option did not function properly regardless of it being checked on or off
  
• Fixed a code bug with WebAdmin chat logging where it wasn't logging teamsay in Survival and Weekly dedicated servers
  
• Fixed a UI bug with the Server Browser where spectators incremented the player count on dedicated servers
  
• Fixed a gameplay bug with spectators where they could receive credit for dailies, weeklies, and achievements
  
• Fixed a gameplay bug with the Trader Pod auto-trade feature where it was unintentionally triggering for players. Players now need to hold the button for 2 seconds before the auto-trade occurs

PS4 and Xbox One

• Fixed a console bug where some players were not receiving their reward items
  
• Fixed a UI bug with the Christmas seasonal objectives where the Vault Dosh values were not displaying on dedicated servers for new clients who have not done any of the seasonal objectives
  
• Fixed a UI bug with the Audio/Video menu where selecting to default the values sets the gamma slider to the highest setting

Xbox One

• Scaled back Xbox One X native resolution to 1512p to smooth out frame pacing issues and performance bottlenecks during gameplay
  
• Fixed an issue where the Dosh Vault would visually be granted too much dosh and then look like it will fail proceed. The correct amount has been tracked, but a weekly may need to be accomplished before it fully corrects itself
  
• Fixed a crash bug with the Nightmare map where exiting out of a Nightmare game session and returning to the home screen could cause a crash
  
• Fixed a gameplay bug with Krampus Lair where the King Fleshpound was able to spawn as the boss during the Christmas seasonal event
  
• Fixed an item granting bug with DLC items where some players were not receiving DLC items in their Inventory after purchasing them

Hello everyone!

While much of our previous conversations have detailed many of new and improved content coming with the next Killing Floor 2 update:

• 3 new weapons http://steamcommunity.com/gid/103582791434017605/announcements/detail/1655505702398839831
  
• 2 new maps & Endless Mode http://steamcommunity.com/gid/103582791434017605/announcements/detail/1648749673594342561
  
• More places and reasons to Stand Your Ground http://steamcommunity.com/gid/103582791434017605/announcements/detail/1655506336051639063
  
• New Character - DAR http://steamcommunity.com/gid/103582791434017605/announcements/detail/1648749039609296137
  
• and the Rioter as a reworking of the previous Elite Alpha Clot http://steamcommunity.com/gid/103582791434017605/announcements/detail/2742000471546110348

Today we want to talk about some Quality of Life improvements heading your way! Along with the usual list of fixes (many thanks to our community members who provide detailed bug reports) across all platforms targeting many of your top issues such as crashing, memory usage/loading and more - expect a near full list with the upcoming Beta build.

Some other changes include improvements to how the trader menu shows you are low on ammo and the ability to arc grenades (such as from the m79) up into the air, for what goes up, must now come down. And something we think many of you will enjoy... A button to skip trader time! If all players in the match hit the button, the remaining trader time will skip forward to 5 seconds.

Now the question many of you have been asking is when. We are happy to announce our goal of the first Steam beta build being available next week! This is, of course, subject to change as we continue to hammer down issues both with the game and the build process. We look forward to your feedback and bug reports to those who choose to dive into the beta with us!

Hello everyone,

With the full release of the Killing Floor 2: Twister Christmas event happening next week (on December 12!), we are opening parts of the event up early to those brave enough to help us check for any major issues. Now there are a few things to note about this opt-in beta and how to join:

• While we are not expecting any major bugs to show up to ruin Twisted Christmas, they just might (that is the reason this beta exists).
  
• If you encounter one, please provide us with as much detail as possible how to reproduce it. This will help our teams find it and fix it faster. Being vague or referencing things that "everybody knows" generally is not helpful!
  
• To join this test, "Right Click" on the game in your Steam Library and choose properties. From there select the beta tab. On the beta tab you will find a drop down box. Choose the option "preview" from that box and hit OK.
  
• To opt out, you go to the same location and choose "none" from the drop down box.

While this beta includes the majority of content and features of the Twisted Christmas event, it will not include any seasonal event specific drops. Players progression, such as perks and achievements, will be saved and carry forward. With that in mind, there are some major changes we would love to have an extra eye or two (or a thousand) on!

• The Twisted Christmas Zeds are ready to roam, and they hope you taste delicious
  
• The Abomination/Krampus wants to give you his special kiss
  
• A new system should be in place to look for and grant missing Dosh Vault crates that players have earned
  
• And a myriad of fixes that will be detailed out in the changelog

Server admins who wish to help test this update can update their servers can run their server update script with the following addition: app_update 232130 -beta preview

A big thank you for all who choose to help us out! The full changelog can be found here:
http://steamcommunity.com/games/232090/announcements/detail/1469727073445811041

Highlights

• The Twisted Christmas Zeds are ready to roam, and they hope you taste delicious
  
• The Abomination/Krampus wants to give you his special kiss
  
• The New Map Krampus' Lair awaits your exploration
  
• 2 Naughty New Weapons - The UMP 45 and Freeze Thrower
  
• A new system should be in place to look for and grant missing Dosh Vault crates that players have earned

Balance Changes
Demo

• M16m203
  
  • 1 extra mag added to initial ammo pool
    
  • 2 extra mags added
    
  • 1 extra grenade added
    
  • Grenade damage increased 50%
    
  • Regular grenade reload speed increased 11.8%
• Pulverizer

• Added to perk as a cross perk weapon

Medic

• Medic weapons now have new custom sights

Zeds
We've adjusted the scale on the following zeds to further help them to stand out more easily in game.

Quarter pounder

• Scale dropped down 5%

Crawler

• Scale decreased 10%

Albino Crawler

• Scale up 10%

Alpha Clot

• Scaled up to 10%

Bug fixes

• Fixed an issue where the King Fleshpound sound effects did not play correctly
  
• Fixed an issue where the admin console command kick and kickban did not work
  
• Fixed an issue for spectators where the incorrect music would play at the end of a game
  
• Fixed an issue causing spectators in a game to affect the displayed player count
  
• Fixed issues with Razer and Alienware LED keyboard effects
  
• Fixed a number of issues with cosmetic items not displaying correctly
  
• Fixed an exploit on the Nightmare map
  
• Fixed an issue in Tragic Kingdom where some environmental sounds played even when the player had left the area they are supposed to play in
  
• Fixed localization issues in Russian, German, Italian, Polish, Korean and Japanese
  
• Fixed an issue where the commando chicken skin would clip with certain weapons during reloading
  
• Fixed an issues with the iron sights of the centerfire rifle not aligning properly
  
• Added the Stoner and Spitfires to the workshop upload tool
  
• Fixed an issue where projectile weapons did not always break glass or destroy collectables
  
• Fixed an issue where dedicated servers did not always update Steam Workshop content
  
• Fixed an issue with webadmin where Clan Motto or Weblink fields would not display after a map travel

Instructions for how to opt-in will follow shortly!

As the end of the year approaches, only one real question remains: Who has been naughty? This may be more important that you think, because Robo-Santa is back and he's brought some new friends to his yearly "Naughty List Appreciation Celebration", where he checks off his list of everyone who has annoyed him... and end them. To better start off the new year with a clean slate to be sure!

Well it seems he's already started on this years plan by heading North, way North, no, not that far North. Welcome to the new and improved "Krampus' Lair", where Santa's elf-napped elves have been put to work for a far more nefarious purpose.

http://media.tripwirecdn.com/113017/lair.gif

Mercenaries have been tasked to infiltrate the festive facility and put an end to its newfound overlord. You see, Robo-Santa has instructed his new minion, Krampus, to upgrade his lair in preparation for these holiday plans (Don't worry, Robo-Santa and and Hans will show up as well!). And it seems Krampus has left a few words for you to ponder in well... let us call it his audition tape:

http://media.tripwirecdn.com/113017/krampus.mp3

While exploring this chipper environment, players will encounter not just the new "stand your ground" for some extra trader dosh, but some jovial new Seasonal objectives as well. Those who complete them will find a brand new set of pajamas waiting for them!

http://media.tripwirecdn.com/113017/obj.gif

Our goal is to have this new content (including: The new seasonal event, 2 new weapons, a new map and a new Boss) in player hands for a full release December 12 along with other quality of life improvements, and bug fixes. However, players who wish to join an opt-in beta next week on December 5th will have first look at almost everything this update holds. For those who chose to join us, please let us know if you encounter any issues so we can work to address them before the full rollout.

Oh, and one final thing. It seems some of the twisted creatures have sent along a few audition tapes of their own for you to "enjoy". First up is the Gingerfast:

http://media.tripwirecdn.com/113017/gingerfast.mp3

And if that doesn't get you in the holiday mood, maybe this Elf work boss will:

http://media.tripwirecdn.com/113017/elf.mp3