Concept art has been discovered which shows a new kind of infected which we are yet to see.

Found in the pre-loaded Left 4 Dead files, concept art for a character simply called 'screamer' shows either we are yet to see every type of infected encounterable, or an early idea for a type of infected that was scraped.

Along with the screamer art, there is also concept art for the Witch too. Check out both just below.

There is also yet another update to the Left 4 Dead demo, which includes the following:

• Fixed a bug where the connection to a server would get stuck in a looping state
• Made sv_steamgroup_exclusive not connect to matchmaking. Removed sv_unreserve, private servers should sv_steamgroup_exclusive now
• Improved the speed in finding a game lobby
• Fixed a bug that could cause you to search for a game lobby indefinitely

 17/11 - 19:55 Left 4 Dead tomorrow, TV Spot #2 now

 16/11 - 00:53 Left 4 Dead Demo Update Released

 15/11 - 14:33 Left 4 Dead Movie Posters Released