No doubt the reason why Nintendo doesn't give detailed specs. On paper, it looks underwhelming but in real world scenarios it's surprisingly competent. At this point, I couldn't care less how many FLOPs the GPU has. I have no doubt the Wii U is a highly specialized machine like the GameCube was and the games will look and perform amazing.
That could very well be true, but if I'm reading things correctly this is going to make 3rd party porting very difficult and probably unlikely.