This is a load of bull coming from a Sony development house. How can I tell? First there are the inaccuracies that sound like they are based on old dev kits instead of anything recent. Second, we've got this gem:
"Some developers are looking at the PS3/PS Vita combo as being more powerful than the Wii U with tablet controller, and easier to program, too. 'You can do everything with that combo that you can with the Wii U, and more,' said the source."
Yep, Sony development house confirmed. Nobody else has ever claimed that Sony systems are easier to program for than the competition, or cared enough to talk about console/handheld interaction.
All kidding aside, I don't believe that Wii U will be less powerful than current systems. That simply doesn't make sense to me. However, I also don't believe that Wii U will offer a huge leap forward in power - or that such a leap is particularly necessary or beneficial. (And where additional power
will be exciting is in AI and general processing power, not graphical improvements.)
Just my two cents.