[Update: 08.22.2010]Valve has reportedly toldPC Gamerthat "The Sacrifice" will launch on October 5. The PC and Mac version will launch for free while the Xbox 360 version will cost 560MS Points ($7). According to PC Gamer, the Mac version will launch on October 5. Shacknews has contacted Valve to confirm the Xbox 360 version of the DLC will release alongside the PC and Mac.[Original: 08.21.2010]Last night onGameTrailers TV, Valve's Chet Faliszek revealed info on upcoming downloadable content for those still waging war on the zombie threat.(Note: The GTTV video contains spoilers on "The Passing" DLC.)Faliszek revealed a new downloadable content pack, dubbed "The Sacrifice," is coming to both the original Left 4 Dead and its sequel,Left 4 Dead 2. A precursor to the previous DLC "The Passing," the upcoming pack will tell the story of how the original Left 4 Dead team lost one of its team members to the zombie outbreak.