Despite some hints found hidden in a config file of the PC demo of Bioshock, lead designer Ken Levine told Joystiq that a PS3 port of the game just isn't happening:

"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."

I'm still holding out hope for a Commodore 64 port. After all, I doubt that Microsoft exclusivity deal applies to the past!