I just had a really good thought, I'll bet this is how it'll turn out: I think it will be a lot like Half Life 1, DNF will come out on its own, with barebones dukematch. Then within a year we'll get an expansion where you play as a soldier and can play co-op if you want. Then the next update will be all the multiplayer craziness.
....And then maybe ONE more where you play as a security guard
