The Mutations are week-long events that offer new ways to play the game, such as this week's "Realism Versus" Mutation and the upcoming campaign-only "Chainsaw Massacre," which will give players chainsaws with unlimited gas--and nothing else.
Only one Mutation will be available at any given time, changing weekly. A monthly poll will allow players to vote on which Mutation they would like to return the following week.
Bringing three Left 4 Dead survivors together with their L4D2 counterparts in a new campaign along with new game modes, weapons and the 'Fallen Survivor' infected, The Passing costs $7 (560 Microsoft Points) on Xbox 360 but will be free on PC.
Still waiting for the release on PC :(
I can't check the Steam forums anymore because it's full of spoilers.
i saw no spoilers and no correct release time :P
Holy crap, I took the afternoon off work. Picked up anything we needed from the store including a fresh dozen cold ones. Explicitly laid out the reasons why my wife shouldn't disturb me for anything but a house fire. And now here I am on Shack instead of playing.
That's what I get for skimming the blog at work and not considering it only applied to the 360.
oh well. There's eleven more beers to drink before I start getting irate. :)
D/L it now on the pc.....