The boys and girls at Valve have revealed the next DLC pack coming for the Left 4 Dead-series - in an interview with Gametrailers, Valve's Chet Faliszek announced that The Sacrifice will be available in October for both Left 4 Dead and Left 4 Dead 2.
In The Sacrifice we'll be playing as the original survivors and find out what happened to the one that died and never showed up in the previous DLC The Passing. There is a canon version, which will be featured in a digital comic, but when playing The Sacrifice we'll actually be able to choose who dies and who will live.
The Sacrifice will also include the No Mercy-campaign from the first game, adapted to Left 4 Dead 2. The whole game will also be available for Mac players at the same time as The Sacrifice is released.