The Wii U is apparently in high demand if you look at the sold out signs everywhere. Is Nintendo keeping the initial inventory low to create a shortage? I guess there is some of that. Nintendo needs to see how high the demand really is to adjust production levels.
The Wii U seems to be priced right ($299.99 and $349.99) and Nintendo fans are buying into the new gaming paradigm. The Nintendo 3DS was not priced right initially. Looks like Nintendo learned something. What I actually like most about the Wii U is the TVii service. The unified user interface to cable TV and other sources like Netflix is really well done and adds real value.
If you have not pre-ordered a Wii U you should not get nervous yet. I am pretty sure that Nintendo will get more inventory after the Wii U release on November 18. Right now the pre-order inventory is completely sold out across the nation and online. The last available Wii U in stock was detected on October 1st by Zoolert.
On Amazon and eBay the prices of the Wii U offers are already double of the suggested retail price. I recommend not to take these offers and wait. By early December there should be new Wii U stock. What you will not see are Wii U Black Friday 2012 deals. For these you have to wait until Black Friday 2013.