Today Valve announced
plans for Left 4 Dead's first DLC, called
The L4D Survival Pack. It will include a new game mode and two campaigns for Versus mode. The new content is coming to both the PC and Xbox 360 versions of the game (a PS3 port to the base game
still seems unlikely). The
press release goes on to say, "In addition, for PC gamers and aspiring developers, the first
Left 4 Dead release for the Source Software Development Kit (Source SDK) will allow the creation of custom
Left 4 Dead campaigns that will be discoverable via
L4D's matchmaking system. The SDK update is also due for release this spring, and is free of charge to all owners of
L4D on the PC." The Opposable Thumbs blog also reports on a way to
play Left 4 Dead in 3D.