EDIT: THIS IS ALREADY RELEASED NOW!
Valve just released a trailer and screenshots for "The Sacrifice" DLC, which is in development for both Left 4 Dead and Left 4 Dead 2. As fans of the franchise will know, "The Sacrifice" is going to explain why Bill, one of the original four survivors from the first game, is dead in "The Passing" map, which was released for L4D2 a few months back.
"The Sacrifice" downloadable content is due for release on October 5, 2010. It is the prequel to "The Passing," and takes place from the L4D Survivors' perspective as they make their way South, before meeting up with the quartet from L4D2.
In addition to advancing the story, "The Sacrifice" introduces a new style finale featuring "Sacrificial Gameplay" where players get to decide who will give their life so the others may live.
The Sacrifice DLC for L4D1 and L4D2 are separate downloads for each version of the game. In The Sacrifice for Left 4 Dead 1 gamers receive the complete Sacrifice campaign with maps playable in Campaign, Versus, and Survival modes. In The Sacrifice for Left 4 Dead 2, owners receive "The Sacrifice" campaign playable with the original Left 4 Dead Survivors. In addition, those with Left 4 Dead 2 receive L4D's "No Mercy" campaign. Both campaigns are playable in Campaign, Versus, Survival, and Scavenge modes and both will feature the Left 4 Dead 2 Special Infected, items, and weapons.
The Sacrifice DLC is available October 5th for both Left 4 Dead 1 and Left 4 Dead 2 on the PC, XBOX 360 and OS X.
as for the XBOX 360, "The Sacrifice" will be available for download on Xbox Live for 560 Microsoft Points.
"The Sacrifice is coming This Tuesday! Tuesday! Tuesday!!" -l4d blog