I have my own theory on what Nintendo is doing.
Casuals are no longer interested in consoles they are now exclusively in the tablet and iPhone camps. Nintendo Wii-U clearly has some great technology in the unit with the tablet and off screen streaming that they will want to leverage. Nintendo want's that market and wants to bridge that and consoles into it's own class of device. Enter the NX.
Modified Android base ala Amazon Tablets, NX Tegra 1 (heavily modified to not be a Tegra 2 level but a 1.5 level of the Tegra) which can already do 720p / 60fps and 1080p as well. So a modified version of that would easily support 1080p 60fps docked, and probably 720p in mobile mode. Nintendo will have a store which users can get all the apps they want Netflix, etc and Nintendo games. It will not have the level of applications as Apple or Google, but it will have more titles and NES, N64 type games.
Eurogamer has a technical video of the Tegra 1
http://www.eurogamer.net/articles/d...-mobile-games-machine-powered-by-nvidia-tegra
I'm envisioning something along these lines in white.
Price point $250.00 to $300.00 Nintendo isn't ever going to offer a 150.00 tablet gaming console.
I expect a full pro like controller as well will be offered for $60.00 each