Left 4 Dead Content Update

Via Bigdownloads:

We are starting to learn more about the first major content update for Left 4 Dead, Valve's hit zombie co-op themed shooter. A new preview over at IGN reveals that there will actually be only one totally new level in the update, which will be one of the 12 maps in the new Survival mode.

The new Lighthouse map is described as a fairly open level with not a lot of places to hide from all of the zombies that will come after you and your three teammates. As we have reported before Survival mode will have you taking on an endless stream of zombies with medals and leaderboards to compare your survival times with friends. The 11 other Survival maps are taken from the game's previous levels. Also the update adds the Versus mode to the Dead Air and Death Toll campaigns. Valve plans to release the DLC free for PC owners sometime before April 21 (that's when a new retail version of the game that includes the new updates will be released).