Yes, it sucks waiting two more weeks for Valve's Left 4 Dead after it was slightly delayed. However, game writer Chet Faliszek did give us more info on this anticipated, zomber fodder-filled title through 1UP's report
According to the report, the DLC content in Left 4 Dead will be "rolling much more quickly" than in the FPS hit Team Fortress 2. Released in October 2007, one of the initial content updates to TF2 (not counting interface/Steam changes) was the Gold Rush content released this recent April. Faliszek explained that DLC plans for Left 4 Dead include more campaign missions, levels, enemies and to the delight of the zombie pyros, a flamethrower will be added "not long after launch".
Also, according to the report, the Xbox Live support of the title will be running on dedicated servers, which means there would be a high chance of having no lag interruption during your online zombie fragfest. Valve didn't really disclose how many servers they would have running, the report said that they company implied that "they'd have everyone covered".
Left 4 Dead, developed by Valve for the PC and Certain Affinity for the Xbox 360, will be out this November 20.