I wouldn't hold my breath on this one. Plus, it'd have to be something more than just the original game to convince me to buy the Xbox version. Maybe if it was GTA3 + Vice + Extra content, but otherwise I don't think it would pay off.
I think that the definitive word for this is going to be at E3. With the number of presentations, announcements and interviews that come out of the show, I'm sure that SOMEONE is going to ask the question, and I'm sure that there's going to be an answer either way. At this point, I don't even...