It'll be a PC Hog, for sure! Bioshock is also on my list of MUST GETS for sure--been waiting for over a year for this.
Also loved all of Looking Glasses games. From Ultima Underworld, System Shock, Thief series and more, it should be stellar!
BTW, there is a group of people working on converting the DOOM 3 editor into a Thief Editor--so it can make a total conversion mod, which looks freaking cool--check the screenshots man!
http://www.thedarkmod.com/