It's that time again. Time to take another long look at Left 4 Dead 2 poster art for a delicious taste of the upcoming DLC, The Sacrifice. This pack is a prequel to The Passing DLC that came out earlier this year, in which the new survivors ran into the original pack of four (including one tragic demise).
The Sacrifice will be available October 5th on Xbox Live for 560
and free to all PC users. There are versions for both Left 4 Dead 2 and the original Left 4 Dead.
For Left 4 Dead 2, gamers receive “The Sacrifice” campaign and L4D1’s “No Mercy” both playable with the L4D1 Survivors. This version also offers 5 new achievements. In the L4D2 version of “The Sacrifice” each campaign is playable in Campaign, Versus, Survival, and Scavenge modes, and both "The Sacrifice" and L4D2 version of No Mercy feature the Left 4 Dead 2 Special Infected, items, and weapons. Yes, Zoey with a chainsaw!
Source: L4d.com