Well if it is just a Wii with more power, I'd be very disappointed. I mean I have a 360 and a PS3. I don't need a Wii to do what they can do. That's why I love my Wii system so much, because it has the things the others don't... and the opposite for the PS360.
I'd hope the next console for Nintendo is a technical upgrade, but they continue to keep focusing on making games fun and interactive and immerse such that we can keep getting interesting new games to come. And if they decided to release another model of the Wii, just like any "new model" they have to sell it to me first. Simply upping the price for a few extra features won't do it.