Admitively I don't know what to expect, they've kept very very quiet about a lot. I'm on hate missles though because of them removing the creator of the first game who was an essential piece to it.
On Steam however it is 26 quid and if you pre-purchase you get Bioshock 1 for free. Bioshock 2 has multiplayer which I dunno will be good or not but I want people to play with me. It is good deal.