While there is one real conclusion to the story, as evidenced in the previous DLC "The Passing," players will have the opportunity to re-write history and select which team member will fall in "The Sacrifice." It won't change the franchise's canon, but it'll make you look totally badass.
Watch the video on Shackvideo.
"The Sacrifice" will be available for free for PC users and for 560MS Points ($7) on the Xbox 360 when it launches on October 5.
While Valve has kept silent on a previously reported Mac version of Left 4 Dead 2, the trailer lists "OS X" as one of the DLC launch platforms. Looks like it's happening after all.