The next generation consoles ought to be quite efficient given the move towards power efficiency in designs as IHC's have hit their various thermal and power barriers and have worked for half a decade to improve efficiency more-so than outright performance. The PS3 and Xbox 360 were designed right on the cusp of the end of the Ghz wars and since then designers have been forced to design for performance within a limited budget and have made great strides over the past 5-6 years.
I don't believe we'll see sub 100W consoles from Microsoft or Sony so the consoles ought to have at least 6-7* the outright performance with an additional efficiency gain on top as embedded memory for instance has improved to the point where it is a practical choice for 1080P games and the designs won't be clocked to the point of inefficiency. The Wii U was designed efficiently and we ought to have even more efficient designs given significantly a greater power budget so it shouldn't surprise anyone when we see the next generation performance so long as their expectations are realistic.
Tease.
