Various early reports (such as IGN) following the PS3’s unveiling at E3 are saying that Sony have mentioned the next GTA could/will be a launch title. This hasn’t been officially confirmed to my knowledge, but I did find this quote lurking amongst a bunch of other quotes from random developers regarding the new console:
“Each time SCEI launches a console, the video games business moves to the next level. With PlayStation 3 it looks as if it might be time for interactive entertainment to become, finally, the world’s dominant artistic medium.”
Sam Houser, President, Rockstar Games
Not an official word on GTA’s fate by any means, but if R* thinks the console is so grand, then why wouldn’t they take the series there?