The Passing

"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."

- Doug Lombardi

The Passing is an upcoming DLC for Left 4 Dead 2 which includes a new campaign and "a new co-operative challenge mode of play." Including new weapons, one melee and one firearm, it also introduces a new Uncommon Infected. The Passing will take place between Dead Center and Dark Carnival, in a rural town in Georgia. It will also feature a meet-up between the Left 4 Dead 2 Survivors and the original Survivors. The campaign will be playable in all the game modes, including the soon-to-be released one. Valve hasn't announced pricing details yet, but they do have a target release window of "early spring" for both the PC and Xbox 360 versions.

A programmer at Valve has stated that 16 player Versus will not be a reality, though he did hint at 8 player co-op as a possibility.