It's been a little while since we joined Coach and his crew of zombie killers on another quest for survival, but next week will apparently add to the story of "Left 4 Dead 2" with the release of a new campaign. Titled "The Passing," this campaign will take place between the first and second "Left 4 Dead 2" campaigns, and will actually feature the original "Left 4 Dead" survivors in some way.
In addition to the cross-over, new modes and enemy types (such as the survivor zombie, who drops handy gear) will be in there for good measure. Hooray!
Keep an eye on the official "Left 4 Dead 2" blog for more information about "The Passing" next week.