Here are the supposed specs:
CPU: “Espresso” CPU on the Wii U has three enhanced Broadway cores
GPU: “GPU7” AMD Radeon™-based High Definition GPU. Unique API = GX2, which supports Shader Model 4.0 (DirectX 10.1 and OpenGL 3.3 equivalent functionality)
Memory: Mem1 = 32MB Mem2 = 1GB (that applications can use)
Storage: Internal 8 GB with support for SD Cards (SD Cards up to 2GB/ SDHC Cards up to 32GB) and External USB Connected Hard Drives
Networking: 802.11 b/g/n Wifi
Video Output: Supports 1080p, 1080i, 720p, 480p and 480i
Video Cables Supported: Compatible cables include HDMI, Wii D-Terminal, Wii Component Video, Wii RGB, Wii S-Video Stereo AV and Wii AV.
USB: Four USB 2.0 Ports
Three cores is just weird. Without knowing the performance of the CPU, the rest of the specs look like they would have been fairly impressive six years ago.