Update v1.21:
Reduced the number of heavy and aggro zombies that spawn on Parking map
Reduced the overall number of zombies which spawn on Parking map
Dynamic Difficulty spawns in Zombies more slowly after a player death
Increased Survivor weapon accuracy

Update v1.20:
New Features:
Chainsaw - Find the new Chainsaw weapon on Level 3, Jim's Junkyard. The chainsaw makes a useful backup weapon, for clearing out multiple enemies at your barricade. The Chainsaw cannot be equipped by survivors.

Explosive Traps - as you progress through the game, you'll begin to collect explosive traps, which can be activated at the beginning of each new night. Any unused traps will be returned to your inventory. Activated traps need to be shot to explode, and take a few hits before they do - time your shots carefully to align with big zombie waves.

Survivor Weapon Allocation - you can now allocate weapons to your survivors at the start of each night. When selecting your loadout from the Weapon Rack, the first two weapons you select will be yours, and the next weapons you select will be equipped by any survivors you have available. Weapons selected for you will be marked in red, and weapons selected for your survivors will be marked in green.

Additional New Features:
New Achievement- Kill an Armored Enemy with a Chainsaw
Added a Difficulty Selection choice to the start of the game

Balance Changes:
Added a Dynamic Difficulty system, reducing zombie spawns when the player has died on that level previously, their barricade is at very low health, or there are multiple zombies attacking their barricade
Generally overhauled zombie spawner settings and area map looting values across the board
Survivor weapon shots are now only partially accurate instead of 100% accurate
Reduced the maximum amount of damage that the barricade can take per second
Slightly reduced time between shots for Eagle
Slightly reduced time between shots for M16 bursts
Slightly reduced the number and frequency of zombies that spawn in on the first level

Improvements:
Fixed survivors fleeing into obstacles
Reduced game install/download size by 800MB by optimizing Barricade, weapon and Zombie textures
Fixed missing stump textures on Zombie Policeman
Increase the thickness and visibility of weapon highlights on the Weapon Rack
Made the graphical option selection descriptions easier to read

Given the number of new features added in this Update, its highly recommended that you start a brand new game instead of loading from a save game.

Update v1.12:
Balance:
Reduced the difficulty of the beginning Forest level
Easy mode is now easier: Zombie health reduced from 80% to 75%
Hard mode is now easier: Zombie health reduced from 125% to 110%
Luger capacity reduced from 8 to 7

Tweaks:
If a reload animation has played for 2 seconds or longer, the reload will be completed even if the animation did not fully play out.
Can view the controls from the ingame ESC menu
Separated Audio and Gameplay tabs in the Options menu

Update v1.11:
Fixed the ragdoll limiter in the Options menu (defaults to 30 ragdolls, can be set between 10 and 35 - lower this setting to improve performance)
Fixed the missing coop text in other languages on the Campaign menu screen
Decreased zombie barricade damage by 10%
Further reduced the chance of runner zombies spawning when your barricade is at 15 health or less