We know the amount of cores, we know the amount of cache memory and we know the architecture being used,so...
Apparently Power 7 uses 8 instructions per cycle, per core, based off 12 execution units and using 4 threads per core. Assuming 3 GHz, the Wii-U theoretically could pack 24 GFLOPS per core and 72 GFLOPS total, just about the same the X360 manages with the Xenon - setting it's extra vector units aside - but with twice the amount of possible physical threads and twice the cache. So... maybe is a bit slower but more versatile? It could surely use the extra punch in the GPU to cover it's deficiency on number crunching compared to the Xenon at least.
Also, someone posting earlier in the thread got it wrong. The Xenon and the CBE weren't "low CPUs with high clocks"; their design was pretty much top of the line when they released, but their clocks were relatively low compared to what the Power architecture usually achieves. The same, to an extent, goes for the Wii-U.
