It's about every 5-6 years that a new system is released by Nintendo...
I would call the next Game Boy "Game Boy Extreme". It would have a 128-bit proccessor and a new analog stick built above the D-Pad.
I would call the next Nintendo system "Nintendo ExtremeCube". It would have a 248-bit processor and will use mini-DVD's like the GameCube. You will also be able to connect the Game Boy Extreme to it and play Game Boy Games on your television, just like with the GameCube!
-----------------------------------------------------------------------------------------------------------------------------
MICROSFT: Nintendo is so old, you should retire! You will fall to the wrath of Microsoft!
NINTENDO: Well, at least WE know how to make good games! Long live Nintendo!
SONY: I like cheese...