LOL i found this picture on google

After being postponed in March it was confirmed by Major Nelson that the DLC will hit tomorrow (April 22) for 560 Microsoft Points and of course for free on Steam like always. Valve claims that the expansion will have a feature called “Mutations” which will rotate new game modes in and out of the game from week to week. A few examples listed for Mutations include “Realism Versus” and “Chainsaw Massacre”.

According to Kotaku the “Chainsaw Massacre” game mode will gear up all of the players with chainsaws with infinite usage.

In addition in will also include some new achievements to score here the list:

Torch Bearer
Survive The Passing Campaign.

Port of Scavenge
Play 5 full games of Scavenge on The Port.

Fore!
Knock off the heads of 18 infected with the golf club.

Til It Goes Click
Using the M60, kill 25 infected without letting go of the trigger.

Wedding Crasher
As the Charger, grab a Survivo

Cache Grab
Open 5 foot lockers.

Kite Like a Man
Kill a tank only with damage from the original Survivors.

Grave Robber
Collect 10 items dropped by a Fallen Survivor.Mutant Overlord
Play 6 Mutations.