Valve has announced what the first downloadable content for Left 4 Dead 2 will be.  This first release will be set after the Dead Center campaign, which features a meet up between the Left 4 Dead 2 survivors and Nick Bill Francis and Zoey from the first campaign.  A new unannounced special infected will also be thrown into the mix as well as a new gameplay mode.  Set in rural Georgia The Passing is set for release on Xbox360 and PC in “early spring”.