What is the latest game of gta?

Grand Theft Auto V

But it may only be out on PS3 long before it comes out on xbox

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Let me guess... you own a PS3, huh?

Since there were WAY more Xbox 360s sold, it will probably come out for Xbox first, just like GTA4 did. If Microsoft throws a ridiculous amount of money at Rockstar again, count on it. However, having said that, a simultaneous rollout is possible, even likely, since PS3 sales have been picking up lately but, the chances of Sony getting favored status from Rockstar are about the same as you playing Zelda on your PS3 chum. ZERO.