Left 4 Dead was one of the finest first person shooters to hit store shelves in 2008, but it was highly criticized for having only four short campaigns.
Well, fear not! For Valve has just announced a brand new expansion pack for the game. The new expansion adds two brand new campaigns to the game along with a new multiplayer mode called "Survival". (I would naturally GUESS it's a "survive as long as you can" sort of scenario)
The new expansion will be available for PC and Xbox 360 sometime this spring. The price point of the expansion has yet to be revealed.