SpartanFX on 01 June 2008
this article is intresting,,one of the producers says from the begining the title was muliplat ,,,MS approached them and paid them for timed exclisivity to brag about it against PS3 without paying for the complete exclusivity.
http://alwaysongames.com/blog/2008/05/29/the-lies-we-tell-bioshocks-exclusivity/
Now if sony gets their head out of their A** ,they will not let the same happen to bioshock 2.(specially after Kaz Hirai said that they are willing to pay)
it seems 2k is switching to ps3 as the lead platform, as they believe it will benefit both versions.
