Did some digging. WiiU's CPU is the Power7 (many of us already knew this).
What many people DIDN'T know is that a Power7 clocked at the same speed as the 360's CPU or the Cell is supposedly overall more powerful - because it's a much newer architecture. It's also more traditionally-designed than a Cell, which means it's easier to develop for.
Power7 comes at a low-end clock-speed of 2.4GHz, and a high-end of 4.25. It comes with 4, 6, or 8 cores.
The most reliable rumor about the WiiU's Power7 is that it's a 3.5GHz quad-core, but with how many Power7s there are that're more powerful than that, I wouldn't be surprised at all if WiiU's is better than that. But even if it's not? It's still vastly more capable than either current HD consoles.
We still know nothing about the other tech specs, however.
To read some more:
http://www.engadget.com/2011/06/07/ibm-puts-watsons-brains-in-nintendo-wii-u/
http://en.wikipedia.org/wiki/Power7
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