Coelocanth: I'm betting (like many others) that they will anyway. This is all just a gimmick to hype the game and drum up traffic.
kyogen: Yeah, I think they'll eventually do an "Ultimate Edition" like they did for DAO: a year or so after release once they've wrapped up all the dlc and are working on the third title. Still, the absurd level of hype that they're trying to generate for DA2 (and the really low quality of the later dlc for DAO) pushed me to cancel my pre-order of the game. I respect DAO and had fun with it, but I don't like the franchise enough to tolerate the marketing and the constant threats--yes, they are threats--of being sold an incomplete product at full price.
As I have said before
I dont know whether this is EA's or Bioware's doing but they are basically saying: "If you don't preorder the game 3 months in advance and buy it on release day - then you aren't getting the full game"
This is Dragon Age: Origins and Mass effect 2 all over again - they want to nickel and dime as much as they can, there is a very good reason why they are focusing so much on the 360 platform
I'll let you folks put 2 and 2 together