Details on L4D2 DLC: "the Passing"

From 1UP:

Valve writer Chet Faliszek appeared on the latest episode of GameTrailers TV to talk about their upcoming Left 4 Dead 2 DLC called "The Passing," and if you want to stay completely in the dark about what twists it'll throw your way, stop reading now -- because Faliszek revealed a pretty major one.
Still with us? Then you probably won't mind finding out why "The Passing" is called "The Passing" -- and it turns out it's a very figurative title. "Someone passed," Faliszek explains bluntly, referring to the fact that one of the four survivors from the first Left 4 Dead -- Francis, Bill, Zoey, and Louis -- will no longer be a survivor in the L4D2 DLC. This is why Faliszek revealed The Passing's tagline is "Nobody Survives Forever."

The plan is to have the original group of survivors from the first game meet up with the new group from L4D2 in The Passing, but only three will actually still be alive by then. Faliszek of course didn't reveal which character will die, but he did explain L4D1 players will get to find out first-hand: After The Passing is released, new DLC will also be released for the original that actually has gamers play through the events that ultimately claims the life of the doomed character -- and one of the players has to literally make the sacrifice within the game.

My guess is Bill is the one that dies, since it's rumored that Valve couldn't get his voice actor, Jim French, to commit to the project. In fact, they couldn't even find him for Crash Course.