Processors:
CPU: IBM Power Architecture processor based on the POWER7 architecture also used by the Watson supercomputer.[3][69]
GPU: AMD Radeon HD based GPU[5]
Storage:
Internal flash memory, expandable via SD memory cards and USB hard disk drives[70]
Slot-loading optical disc drive compatible with 12 cm "proprietary high-density optical discs"
(25GB per layer)[71][72] 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[58]
Wii U GamePad:
Built-in 3-axis accelerometer and 3-axis gyroscope
Speakers and Microphone
Front-facing camera
IR Sensor strip
6.2 inch (15.7 cm) 16:9 resistive touchscreen
Two analog sticks and one D-pad
Stylus
Select, Start, Home and Power buttons
A/B/X/Y face buttons, L/R bumper buttons and ZL/ZR trigger buttons
Rumble
Controller sync button
Bluetooth
NFC[61]
Note: The Wii U is also compatible with the Wii Remote, Wii Nunchuck, Wii Classic Controller, and the Wii Balance Board.[73] 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.
Video:
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.[58]
Audio
"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.