Cold Stream

Cold Stream is an upcoming DLC for Left 4 Dead 2. It was announced in a blog post on February 16, 2011. It will feature Cold Stream, a community made campaign from the creator of 2 Evil Eyes, as well as ports of additional Left 4 Dead campaigns. A release date has not yet been annouced, although it is expected to follow the release of Valve's single player game Portal 2.

A beta will be released in the near future, allowing the community to playtest and improve the campaign.