Cold Stream, the much-anticipated DLC pack for Left 4 Dead 2, is set to launch on PC, Mac and Xbox 360 on July 24. Cold Stream includes a fan-made campaign, and ports of Left 4 Dead's Death Toll, Dead Air, Blood Harvest and Crash Course levels. Valve also has some other surprises and details we will give you later but for now we just want to confirm an often requested feature. With the update going out at the same time (also for the PC), all of the mutations will be available at all times. This will allow players to choose to match into games playing Taannkk!, Gib Fest, or even a user created mutation like Confogl.

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