I wish someone would explain what they meant by "twice as powerful" and how it was measured ...
Having dealt with countless project managers and QA people who have completely misunderstood countless complicated technical issues, I suspect that (unless you're getting this information directly from one of the technical leads) odds are pretty good that "twice as powerful" is an inaccurate over-simplification.
How I would expect this kind of information to be leaked is ...
In a studio that is porting their HD console game to the Wii U, the development team had the Wii U port up and running in a matter of weeks in a highly un-optimized form. While the initial build of the Wii U version may have had the higher detailed graphical assets of the PC version of the game, with some advanced graphical effects available in the PC version, or been rendered at a higher resolution it was only running at twice the frame-rate of the HD console version.