Dunno what platforms but i presume only the PS3 version could face a possible delay.
Interesting points about BioShock...
Before it was decided that BioShock would be set in an underwater metropolis, the team toyed with the idea of setting in on a tropical sland but that was thrown out when Far Cry was released.
Ken Levine has said that if BioShock doesn' t sell then there will be no more ' ...Shock' games for a long time, if ever. He hopes that the game will sell in excess of 2M worldwide.
LINK