Due to release this Spring in the US, the DLC introduces a new multiplayer game mode entitled 'Survival', plus two complete campaigns for Versus Mode, which no doubt will be retooled versions of the current unplayable ones for Versus - Death Toll and Dead Air.
In addition, the first Left 4 Dead release for the Source Software Development Kit (Source SDK) will be made available for free alongside the new content; allowing the creation of custom Left 4 Dead campaigns that will be discoverable via L4D's matchmaking system.
Finally, a Critic's Choice Edition of the game will be heading to retail stores, and will include access to all the content introduced in the L4D: Survival Pack.
No price has been mentioned for the new pack, but it's a relatively safe bet that it will be released for free for the PC. The Xbox 360 on the other hand, is anyone's guess for now.

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