If Nintendo manages to secure GTA V for at least a month of two (I doubt investors greenlighted the waste of enough money to get the full exclusive), I'm going to be laughing for a week.
Wii U's most expected launch is November. Assuming that's the case, Nintendo paying for a "month or two" would push the PS360 versions into January. There's no way Rockstar would agree to that, almost regardless of the money offered. Actually, Nintendo better hope GTA V doesn't launch before the Wii U, because the situation is more likely to be reversed. IF Nintendo gets it at all.
I can picture Nintendo moneyhatting Rockstar to get a version at launch. I can picture Nintendo moneyhatting Rockstar to keep other versions from coming out until the U launches. Timed DLC? That wouldn't hold much value in a game of that scope, since most probably wouldn't have beaten the game by the time that exclusivity ends. Nintendo paying for bonus exclusive missions? Yeah maybe. But I picture Sony and Microsoft doing the same thing.
We'll see, probably by June what's going on though. It *would* be worth overpaying to a certain extent just to get something noteworthy (or get it at all) and to send a message to gamers and the press early. But I'm pretty sure Nintendo will agree that the sticker price of doing anything too interesting isn't worth the investment.