Well ,according to these sites ,only some hours ago the guys at Irrational have confirmed that the deal for the 360 and PC was six months of exclusivity and that PS3 is getting the game in spring 2008 .It should have some added content .
http://psnow.es/2007/11/12/bioshock-confirmado-para-playstation-3-en-primavera-2008/
http://www.n4g.com/News-82491.aspx
I think its a great addition to the stellar PS3 lineup for 2008 ,what do you think PS3 owners ?