Valve will release The Sacrifice new L4D DLC, mainly about the four characters of L4D1, apply to L4D1 and L4D2, L4D2 players can download and participate in games, because this part of the content and L4D2 “The Passing” DLC is associated.

Free DLC The Sacrifice for PC and Mac platforms, Xbox 360 platform need pay.

Valve will release in September in advance online version 150-page comic book to pave the way related story, DLC tentatively scheduled on October 5 on line.

http://www.youtube.com/watch?v=aEWr4G_CHoI