The new episode of GameTrailers TV has the promised previews of upcoming Valve content. The Left 4 Dead DLC announcement chats with Valve writer Chet Falisek, who reveals plans for The Sacrifice, new DLC planned for both Left 4 Dead 2 and the original Left 4 Dead (both Windows and Mac editions), which will offer a storyline that explains what happened to the character who died in The Passing DLC (we are avoiding that spoiler, but be warned it is freely discussed in the interview), though the DLC will also offer the chance for another survivor to make this sacrifice. Also, the Left 4 Dead 2 version of the DLC will also include the No Mercy DLC pack from the original Left 4 Dead. Erik also discusses the four-part, 150-page digital comic which will precede the DLC release with further story elements. They conclude by confirming that they have plans for more DLC releases in the future.