What's really Next-Gen about X-Box 360 and PS3? It's a hype term drummed up to get people to spend more momeny for the same thing with a hardware upgrade. If I buy a new video card, it's not a next-gen computer. Plain and simple.
The Wii is the MOST next-gen of all the consoles, hands down. The other consoles are simply similar concepts with upgraded hardware for the most part.