The 1.88 update is now live as a Beta for you to download with the Beta command line:
Add this to the shortcut you are starting Steam from. Right click on the shortcut, then add the command line after the 'Target' fied so it will look something like:
"C:\Program Files (x86)\Steam\Steam.exe" -beta nationred0728
Remember to let Steam download and update the game. Once updated, the version number on the loading screen will end in '88'.
(This update will become a regular public update around Monday, so if you don't want to play the Beta you'll only need to wait a few days)
Number of enhancements to make custom map making easier, including creating your own Barricade maps
In one game, kill two bosses without killing any other zombie in between
Accumulate 90 seconds of Bullet Time in a single game
In a coop game, play as the Medic and revive team members 15 times in a single game
In a coop game, play as the Gunner and detonate 50 explosives (grenades, dynamite) in a single game
In a coop game, play as the Sniper and deliver the killing blow to 10 bosses using the M107 in a single game
In a coop game, play as the Scout and detonate 5 flash bangs in a single game
Spark. When a zombie is on fire, transfers fire to an adjacent zombie
Aftershock perk now much more powerful
If a player chooses Lone Wolf in coop, this will no longer affect other players. Lone Wolf player cannot pick up Sentry Guns, Ghosts, etc.
In Auto-Perk mode, you can now press the level up key (default is the space bar) to pause the game and see the current list of perks you got so far.
Xp kill score is increased for a few zombies to get fair scoring in line with the zombie strength: Minigun Boss goes from 100,000 to 125,000. Zombie Bomber goes from 5,000 to 10,000 and the Baseball Bat Zombie goes from 2,500 to 5,000.
Adjusted aiming at edge of map for gamepad/controller users
Added an Auto-Fire option for manual weapons such as the Glock. Go to Options->Control->Weapon/Mouse->Auto Fire On/Off
Changed position of the in-game chat box
Minigun and Ak47 bosses won't fire when off-screen
Mingun Boss damage reduced by 25%
After a coop game finishes, all players are automatically set as 'not Ready' so that the game won't restart too quickly
Several other tweaks
Any questions, please post on the Steam forum!