Valve confirms long-in-development downloadable content Cold Stream headed to PC, Mac, and Xbox 360 later this month alongside Mutation update.

Following more than a year of playtesting, Valve is ready to release its Cold Stream downloadable content for Left 4 Dead 2, the company announced on the game's blog recently. The DLC is due on July 24 and packs in ports of the original Left 4 Dead campaigns Blood Harvest, Crash Course, Dead Air, and Death Toll, as well as an all-new campaign called Cold Stream.

Cold Stream comes to life later this month in Left 4 Dead 2.

An update for Left 4 Dead 2 will also be released on July 24, which will make all mutations available at all times, allowing gamers to play the Taannkk!, Gib Fest, or user-created mutations whenever they like. Additionally, Valve said it has "some other surprises and details" to share at a later date.

Cold Stream entered a beta period for the PC and Mac in March 2011 and is still available in that form for those players. No price was announced for Cold Stream, and as of press time, Valve had not responded to GameSpot's request for comment.

For more on Left 4 Dead 2, check out GameSpot's review.

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