Great news about DLC. I finally picked this up last week and I'm addicted. I love this game; though it has a few flaws that drive me nuts. I personally think in VS mode the zombie team needs to be a bit stronger; specifically the Smoker. The Smoker is basically freakin useless, and IMO the "tongue" attack should do damage the instant you snag the dude with it, otherwise WTF is the point?
Also, I've found the AI in VS mode is wayyyyy too good if you're playing as a zombie. I've been hiding in trees and behind haystacks and stuff while playing against a partially computer controlled team and somehow they magically see me where no human player would ever see me. It's pretty annoying.
But, all in all, I still love the game. I think it needs to be patched a bit to balance it a little but that probably won't happen. Great that we'll get 2 new campaigns, that's amazing!