Many outlets are reporting on the new DLC for Left 4 Dead. Worthplaying has a small, but solid, summary:
“The first L4D DLC – dubbed the L4D Survival
Pack — is due for release this spring and introduces a new multiplayer
game mode entitled, Survival, plus two complete campaigns for Versus Mode
. A Critic’s Choice Edition of the game is also heading to retail stores
this spring, and will include access to all the content introduced in
the L4D: Survival Pack.
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.”