Valve today announced DLC for Left 4 Dead 2 would be arriving in the early part of 2010, and will bring the original survivors from Left 4 Dead down south to meet up with the newest cast of zombie fighters.
"The Passing will become the most important campaign in the Left 4 Dead story, as all the Survivors are being called together in one campaign," explained Valve VP of marketing guru, Doug Lombardi, by way of the official press release. "It will also be a huge offering of new gameplay content, with something new for every game mode plus a new uncommon common and weaponry."
The content will also feature new arenas for Versus, Scavenge and Survival as well as a new co-op challenge mode and introduce an entirely new zombie class, all alongside the new single-player and co-op additions to narrative.
Currently "early 2010" is as close to a release date as we have.