"Super powerful" is relative. Crafting a $249 machine that outperforms PS3 next fall wouldn't exactly be a challenge... again, 3DS is probably a good indicator of what to expect, comparable to "current gen" rivals in some respects (for 3DS it's geometry), well ahead in others (for 3DS it's shaders and added 3D). Neither Sony nor Microsoft are really eager to start a new cycle (expect both to hold off until 2012 or later), and this probably also gives Nintendo more breathing room in regards to their next system. Nintendo releasing a comparable/ahead Wii successor next year would likely open the 3rd party floodgates (or portgates, lol) as well, as (again) is basically happening now with 3DS. And getting 3rd parties in early with AAA games seems to be key according to Iwata.
If you want to predict Wii 2, just look at 3DS. DS was a great indicator for Wii strategy wise, you can probably expect the same story this time around...
