I've only played GTA 2 and Vice City and I don't have 360 or PS3 so I'm not hyping this game that much. I just hope the frame rate is more prioritised than in earlier games.
But I'll get it when comes to pc 2009.
Predictions for December 31st 2008:
Wii 38,000,000
DS 84,500,000
PS3 17,000,000
PSP 41,000,000
X360 23,000,000