Just a small correction, while Retail Releases in the US of the PC version or 360 version havent happened and probably wont for awhile, Americans can buy the game Today at US Steam and GamersGate and probably this Website, however for some reason Larians store just shows European currency for me, so getting it from Larian may end up costing more due to exchange rates.
This doesnt help Xbox players but if American PC gamers really want the game, they can indeed get it today like the rest of the world so long as you dont mind Digital Distribution.