CPU: IBM Power Architecture processor based on the POWER7 architecture also used by the Watson supercomputer.
GPU: AMD Radeon HD based GPU
Internal flash memory, expandable via SD memory cards and USB hard disk drives
Slot-loading optical disc drive compatible with 12 cm "proprietary high-density optical discs" (25GB per layer)[
71] and 12 cm Wii optical discs
Ports and peripheral capabilities:
SD memory card slot (supports SDHC cards)
USB 2.0 ports (2 at front of console, 2 at rear)
Sensor Bar power port
"AV Multi Out" port
HDMI 1.4 out port
Wii U GamePad:
Built-in 3-axis accelerometer and 3-axis gyroscope
Speakers and Microphone
IR Sensor strip
6.2 inch (15.7 cm) 16:9 resistive touchscreen
Two analog sticks and one D-pad
Select, Start, Home and Power buttons
A/B/X/Y face buttons, L/R bumper buttons and ZL/ZR trigger buttons
Controller sync button
Note: The Wii U is also compatible with the Wii Remote, Wii Nunchuck, Wii Classic Controller, and the Wii Balance Board. It has been announced through Nintendo Network that the Wii Remote will still be used not only for Wii games, but as a new way to combine it with the experience brought by the tablet controller.
1080p, 1080i, 720p, 576i (PAL Only), 480p, 480i, standard 4:3 and 16:9 anamorphic widescreen
"AV Multi Out" port supporting composite video, YPBPR component video, S-Video (NTSC consoles only), RGB SCART (PAL consoles only) and D-Terminal (Japan only)
HDMI 1.4 out port supporting stereoscopic 3D images.
"AV Multi Out" port. Six-channel PCM linear output through HDMI http://en.wikipedia.org/wiki/Wii_u#Technical_specifications
The NintendoLand footage hinted at a machine clearly more powerful than the PS3. There was a fine detail to everything regardless of distance, and lots going on without any apparent strain. Should be a good machine.
Of course, PS4 will be much more powerful but this comes out this year.