announced that the next batch of Left 4 Dead 2 DLC will include a user-created campaign known as "Cold Stream." Created by Matthew Lourdelet -- known for his "2 Evil Eyes" campaign -- the as yet unfinished Cold Stream campaign will begin community testing within the "next few weeks."
The DLC is planned for the PC, Mac and Xbox versions of L4D2, so no one needs to feel left out. As an added bonus, the DLC will also contain three campaigns from Left 4 Dead 1: Death Toll, Dead Air and Blood Harvest (L4D1's No Mercy campaign was included as part of L4D2's 'The Sacrifice' DLC). Don't get too excited, however, as the DLC isn't planned to be released until after the release of Portal 2, which currently is slated for April.