Very interesting, thanks again. Didn't realize the power draw difference was that vast.
That said, a Surface Pro like PC replacement "tablet" could be a consideration for a scaled Liverpool APU I think. Although I'm not sure how challenging it would be to hit the same TDP of the Surface's i5 or if it would even be worth the engineering effort vs a clean start. Not to mention that since battery life is already one of the Pro's biggest trade offs, it may not be the best benchmark for power draw to use in this case.
We have see which haswell chipset they go with for the Pro 2.
Tegra 4 is an interesting choice for the Surface 2 (aka surface RT 2)