These are images of the Wii U.
Images
Nintendo Direct - Pre-E3 2012
Comparison between the prototype and the final design.
The NFC capabilities.
Using the GamePad as a universal remote.
Patent Images
Patent revealing the design of the Wii U stylus.
Patent revealing the design of the Wii U power brick.
Patent revealing a port on the Wii U controller.
Patent revealing the redesigned analog sticks.
Patent relating to the Wii U console.
Patent relating to the Wii U controller.
Other
Fan-made comparison of the E3 2011 model and a leaked image of an updated Wii U controller.