Don't forget currently with the PS3 being behind in sales is another factor as to why GTA sold more on the 360, simply because it has more consoles out.

With MGS4 coming out, along with those 80GB bundles with it, the PS3 is likely to jump up in the number of sales. Same goes for when other PS3 exclusives start coming out.

In the end, I "Think" PS3 will either be close to, or even more sales, then the 360.

Assuming this happens, given Sam's statement I'd almost be positive GTA will be PS3 exclusive.

Mind you this is under the assumption that the PS3 sales go up that much, which I think is becoming increasingly likely.