According to the latest episode of GameTrailers TV, the upcoming Left 4 Dead "Survival Pack" DLC will open up Death Toll and Dead Air for Versus campaigns, and the new Survival mode will feature "up to 4 players setting records for the longest time surviving hordes of zombies on over 12 maps." We're assuming these are 12 existing maps, but your guess is as good as ours.
The Survival Pack DLC is scheduled for release this Spring.
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