DC is on the East.
Honestly, I don't really want another one. I want everything to be congregated into L4D2. If there was another one I'd buy it up no problem, but it seems a bit redundant. Unless they added a crap ton of new stuff like they did from L4D1 - L4D2.
Anymore I think the best bet is to go with fan created stuff. The Keith Rochelle cover is amazing as it is. I think we have the ability to do custom voices now, too? Perhaps it's even possible to recreate the entire survivor team with new characters and essentially make a new campaign in an entirely different "world" even.
Just a thought, but with their source kit it really does open so many doors.