I would release the WiiU for 300 (put your currency here, we don't do exchange rates in Nintendo) between October-November, bundled with WiiU Play containing five tablet/wiimotes asymmetric Mii-ni-games (a few taken from the demos).
The system would also launch with the eShop having access to all previous Wii online software (transfer option available); plus a few WiiU software like those screensaver (garden, street) and that drawing game. I like the idea from freebs2 of having the first few lesons of Art Academy available for free as the first WiiU demo. Also launch would also have media streaming software for Netflix, etc, and Nintendo's own title called Wii TV compatible to stream via the 3DS through UPnP and to/from other UPnP devices/servers.
Second U controller bundled with a game made specifically for two U controller asymmetric gameplay, sold for 90.
Nintendo launch software: Art Academy Wii U, New Super Mario Bros. Mii.
Third party software: Killer Freaks, Pictionary and some improved HD ports.
Retail games prices similar to the Wii, sold between 50 to 60.
The launch window would have: Big Brain University, Pikmin 3, Wii Sports U, new Retro game. During 2013, the first month release would be Wii Fit U + sensor band, with a later release of Endless Ocean 3 and a gyroscopic detective game during spring, leading to Mario Kart and Metroid for the fall.
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I like your idea of the WiiFit integrated in the OS. I'd have it work with the 3DS and those DS pedometers, they would connect through the IR port on the U controller. I'd also implement some comunications integrated to the system (independent of the game), and through a profile page a social hub is shown via the U controller which lets you see your friends, chat with them, talk to them or even video conference while playing games.
