According to 2K Games official website, a demo for the PlayStation 3 version of BioShock will be hitting the PlayStation Network October 2nd.
"The worldwide release of the BioShock PS3 demo is scheduled for October 2nd," wrote Elizabeth, a 2K Games rep. "That’s less than one month until you get your first taste of Rapture on the PS3."
The full game is due out on October 21.