...and these aren't official specs from Nintendo, but these are some supposedly leaked hardware specs for the Wii U console:
Graphics: Custom AMD RV770 Chip “WOLF” @ 766Mhz on 32nm process 1398 Gflops
CPU: Custom IBM Power 6 Chip “FOX” on 32nm process
4 cores, each two way SMT-capable and clocked at 3.5 GHz
175.9 GFLOPS theoretical peak performance (single-precision)
87.6 GFLOPS theoretical peak performance (double-precision)
Memory: 512 MB XDR2 DRAM main memory
+ 1024 GDDR5 video memory
+ 16 MB eDRAM
Storage: 2.5-inch SATA hard drive with 250 GB / 320 GB capacity
Expanded storage via SD and SDHC card memory (up to 64 GB)
Media: Custom Blu-ray Disc, up to 50 GB
Compatible with 7 cm Nintendo GameCube Game Disc and 12 cm Wii Optical Disc
Display: Video output formats
Composite video: 480i, 576i (PAL)
S-Video: 480i, 576i (PAL)
RGB SCART: 480i, 576i (PAL)
Component (YPBPR): 480i, 576i (PAL), 480p, 576p, 720p, 1080i, 1080p
D-Terminal: 480i (D1), 480p (D2), 720p (D4), 1080i (D3), 1080p (D5)
HDMI: 480p, 576p, 720p, 1080i, 1080p
Pretty impressive, and slightly higher performance then the previous rumored specs. If this is true then the Wii U will be significantly more powerful then either the Xbox360 or PS3. Although in typical Nintendo fashion, it's still underpowered by modern 2012 PC standards. The upcoming Sony/Microsoft consoles will no doubt outperform this.
http/www.guru3d.com/news/wii-2-possible-leaked-specifications/