To be honest, I think Nintendo's going to pull something completely unexpected. Nobody really expected the DS, and unless they decide to play it safe, theres a chance the new Game Boy could just blow everybody's minds out their heads. At least, I would hope.
Another big "ooh, let's make mock-ups of this" question is, what is the revolution controller going to look like? My guess is that it will have a couple of standard buttons, then a touch screen in the middle that electronically changes to images of controllers for old systems. Touch the screen in the appropriate places and the buttons will press. Certainly a way for them to play all old games at once, and I know Nintendo isn't just going to have their touch-screen technology be one-trick pony....or are they?

Making the world a better place since Negative 666 B.C.
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