There is a power gap, but no where near the gap between the ps3 and wii, the wii u's gpcpu whatever you call it is unique and developers havent yet fully figured out how to utilise its full power, but as many developers have said, the wii u is quite capable, its just about how to tap into the power
getting this on the wii u, i gotta support the third parties, if 3rd party games sell well on the wii u it would give developers a reason to put games on the wii u.