Recently details were added to the official Left 4 Dead 2 Blog that have revealed the contents for the upcoming DLC titled ” The Passing”.
What you can look forward to playing this Spring:
A Wicked Witch Bride!
A Gargantuan M60!
A Slashing Golf Club!
The Fallen Survivor!
Meet 3 Left 4 Dead 1 Survivors!
New Game Mode(s)!
Still no word on the exact timing of the release date for this content, but expect an announcement in the near future. After all spring only lasts so long.