The PC version will be out sometime between Tuesday and Friday next week. I talked to my BioShock developer contact today. He wasn't too upset about the fact that the XBOX 360 version has been sold early by Toys 'R Us, nor that it's been released on torrent sites.

Him: It's not too bad I think... It's much better that the 360 torrent is out than the PC one.
Him: I don't think there are enough modded 360's out there for that to be too much of a problem long term.
Me: The PC version being cracked/torrented this early would be catastrophic though.
Me: So what prevents Toys 'R Us from selling that early as well?
Him: The actual executable isn't in the PC box.
Him: You have to download it from Steam or IGN on launch day.

"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram