Coming to PS3 too.
Serveral PS3 demo units were seen running GTA IV Lost and Damned at E3 earlier this year. with a line of punters waiting to play it.
Obviously rockstar can't SAY anything about it as their contract prevents it, but if Sony want to put up some demo units, who were they to stop them.
I'd suspect by Jan we will get a date for both PC and PS3.