Good luck with that, most people are reporting that they were able to walk in stores and pick one up the following day, so I have severe doubts the demand is as wild as it was for the Wii.
I'm not too interested in the Wii U. It doesn't seem to do anything I can't get from my PC or a last-gen console, and really doesn't justify a $400+ initial investment. It's got a blu-ray drive, but can't play BR movies or DVD's. It has all sorts of "apps" for it, but only Netflix even works right now, and TVii was quietly pushed back a month or two. It has all these interesting features, but Nintendo says it's up to the (already burdened) developers to ensure any of them make it into the game. It has 2 new controllers, and you still need the old Wii-motes, so all in all you'll need 3+ seperate controllers near the system, just in case (some menu navigation requires a wii mote be used). On top of all that, it doesn't have any amazing first party launch titles. No Zelda\Metroid\Donkey Kong\SSB is a no sale for me.
I really just don't see who Nintendo is targetting with this system. Families? Because nothing says kid friendly like a nice big screen smack dab in the middle of a $100-150 controller, on top of the fact that the package you'll want is $350--$100 more than the Wii was at launch. On top of that, all the commercials make it out to just be some kind of tablet\controller peripheral for the Wii itself. Nintendo marketing did a great job with the Wii, but a miserable one with the Wii U. Imagine the surprise on people when they walk in and find out that neat little Wii Gadget they saw on TV is actually its own system, and will cost them at least $300.
Are they targeting "hardcore" gamers? Really? With a bunch of titles that have been out for several weeks or months on systems they already have? Why would someone pay $430 to get a Wii U and Black Ops II, when they could just pay $60 and get it on their X360? You'll have to do better than that Nintendo. Those die hard fans want Pikmin 3, or Metroid, or Zelda, or SSB. New Super Mario Bros U seems pretty disappointing compared to games like SMG and Mario 64. Basically, the only game that's going to really appeal to this audience, is ZombiU. But it's not the kind of title that can really sell a system.
I think the Wii U is going to sell great this holiday season, and quickly trail off, especially if Sony or Microsoft announce a new system at the end of the winter. If we see a PS4 or Xbox 720 announced with better hardware, better media support, and a similar price point, I think it's going to devour Nintendo's sales early on--assuming we get a launch next year around this time.