Valve has reiterated some details at x10 tonight regarding its Left 4 Dead 2 add-on, The Passing, slated for release in early spring.
The Passing brings the original survivors down south for shoot-fest with the Left 4 Dead 2 crew, and will contain new single-player, multiplayer and co-operative gameplay.
It also includes new co-operative campaign, associated narrative and new arenas for Survival, Versus and Scavenge modes, as well as a new co-operative challenge mode.
This was all announced back in December, so consider this a public service announcement from Valve to get you pumped for it.
Hopefully, it worked.
Assets are starting to trickle through from the event, so hopefully some will be released for The Passing as well.