Final Nintendo hardware previously was weaker than the development kits. Often the development kits could be scaled down to match final hardware. That said this seems pretty legit.
Don't forget the wii u had 3 terrible powerpc 32bit cores designed in the last century. These arm 64bit cores are running almost twice as fast with double the datapaths and there is an extra cpu.
wii u main memory is only 12.8GB/s and the gpu only 176 gflops. There is only 2gb of memory in wii u of which 1gb is for games.
Looking at the figures it looks to be about 3x as powerful overall. Capable of running enhanced versions of 360 and ps3 games on the go and perhaps a little more at home.








