Valve has put a release date on the next DLC for L4D3, the ‘Cold Stream’ campaign will release this July. You can find all the details on the new DLC below.
The news was released on the L4D2 blog where Valve announced the ‘Cold Stream’ DLC will land on July 24, 2012. Valve also took this opportunity to say that the “entire DLC consisting of Blood Harvest, Crash Course, Cold Stream, Dead Air, and Death Toll” will release on the Xbox 360.
Valve promised more information on a later date, one last note, “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”. Valve said that was one of the most requested features from players and wanted to add that in.
source | l4d2