First, MS declared on the lime green Bioshock case - "Only on Xbox 360".
Second, the lead designer for "Bioshock," Ken Levine, said there wasn't a PS3 version in the works. According to a joystiq.com article, Levine said, "I promise you, there is no secret plan about the PS3 that we're keeping from people. There's no PS3 development going on that we're hiding. There's lots of stuff that gets into game code, plans change over time and we got an exclusive deal with Microsoft ... that's not a Rosetta Stone discovery."
Then, a 2K mod said it was a rumor.
Now, dukecitygamerz.com has gotten confirmation from a 2K representative.
"BioShock will not be released on the PS3. It is just a rumor."
That's it, folks. If you have a PS3 and looking for "Bioshock," the only way you will play it is on a PC or a 360. End of story. Move along ...