Nintendo knows that they'll sell 5M consoles without any special effort so why push more when they are already supply constrained? The real battle for hearts and minds starts in 2013 as they'll need something impressive to go up against the new generation of consoles as the bejesus will be hyped about them so above all the chatter they need to deliver product against the infinite expectations of the gaming population.
When developers start designing games to run with many gigabytes of RAM the Wii U whilst being more powerful won't look it given very few people lack the eye to see the technical details. So whilst it will run titles which cannot be done on the HD consoles it won't look any better because developers will design to higher constraints. This is the same reason why there was so much angst about the use of the Wii's performance and the perceived lack of effort by developers.
The Wii U will be another Wii because that was what it was designed to be. It'll combine a next gen interface and OS with last gen performance. What the Wii U won't be is unexpected so it cannot rely upon surprise and shock/awe to drive sales as both Sony and Microsoft will target them from day 1 as they cannot afford to ignore it. Microsoft already offers Smart-Glass before the Wii U is even on the shelves and Sony are likely thinking about designing a cheap cut down Vita as a similar control scheme to the Wii U.
The major difference between the Wii and the Wii U is that both Microsoft and Sony can affordably offer similar values to the Wii U when they couldn't do the same for the Wii. If third party developers give great support then dropping it into a PS4 or Xbox Infinity game will be easy, and if third parties don't support it then it doesn't cost them any extra effort as they are only looking to counter with entirely existing technology and not a completely new paradigm.
Tease.
