I think the specs on the Wii U are probably much closer to final production specs than some seem to think.
All evidence points to a modified AMD R700 based GPU, most likely an RV770 variant quite similar in performance to 2008's HD4850. CPU looks to be an IBM Power7 core based chip, most likely a quad core.
Currently, it's looking like final memory specs are the only major specs that haven't been specified by multiple reliable sources. Shared memory or dedicated VRAM/system RAM configuration? 768MB of shared memory seems to be the current number being speculated by various sources.
Based on that, you potentially have a console with an updated CPU similar to that in the Xbox 360 with an extra core, and additional 256 MB of shared memory and a GPU that should have anywhere from 50-100% more graphical processing power than the modified R520/R600 based GPU of the Xbox 360.
It goes without saying that how that translates into actual game performance depends on a list of factors although on raw specs alone, 1920x1080 native render resolutions with frame rates closer to 60fps than 30fps is a pretty fair estimate.







