Speculation, nothing.
We don't know anything about it at all, so let's speculate because it's fun!
Rumors:
Nintendo is developing several Revolution games with Mario in them.
NST is working on a racing game of some sort for it.
It's heavily rumored it'll have better graphics than any current generation system.
It's whispered in dark circles that Nintendo fans will definitely like it "no matter what".
A new Zelda game is in the planning stages.
They'll make an online Pokemon game.
The revolutionary controller will be similar to past units with some sort of simple, easy to use added control method.
SHOCKING PREDICTIONS.