At this point,and with what we hear, the real concern is not how powerfull it is regarding the actual consoles (i was always certain that it would be a Nintendo usual case of more with less, always).
The thing we know, that can be a concern, is that making beautiful, or impressive things on the hardware will need dedicated and specific effort. Everything right now tends to show that.
That means... Gamecube.
The dream of seeing PS4/XBX8 ports is pretty dead, if there isn't real quick some good tools to facilitate it, and real good ports of next gen engines.
This is pretty simple. Most editors of a certain genre aren't that crazy about porting their game on a Nintendo console already. If it gives them problems, it's pretty dead.