Wii U specs are surprising, says Sonic developer, specifically the GPU and memory

[Crono141]

Done with 45 nm tech. Chips done with the same fabrication technology, with the same power envelope, can't be several times faster than other chips unless there is a big design flaw. We supposedly have here a WiiU console with a smaller power envelope than X360 and PS3, but several times faster... I'm sure that MS and Sony Engineers aren't retarded.

I must have missed the leak or confirmation that the WiiU's CPU and GPU are 45 nm dies.

http://wiiudaily.com/wii-u-system-specs/

There is no source link in that page.  Sounds like speculation to me.