Concept Art: Left 4 Dead 2.

Kotaku have posted up some great Left 4 Dead 2 concept artwork they have acquired from Valve.

There are 11 images in total; 5 covering the new characters and 6 covering the proposed locations from the game (these are definitely the pick of the bunch).

If you hit the full size option, you'll be treated to the images in all their massive glory (and they really are HUGE), ideal for your desktop or for framing.