I noticed the battery life listed on the website exactly match those listed on Nvidia's site for tegra 2:
http://www.nvidia.com/object/io_1262837617533.html
Nvidia got those numbers testing on a 5 inch tablet (and even then it was probably best case scenario). I find it unlikely that a 10 inch tablet in transmissive (regular) mode would achieve the same numbers (16 hours hd video) unless 1) Pixel Qi has significantly lower power consumption compared to normal tablet/mid screens in regular mode as well or 2) 5 inch tablet Nvidia tested on wasted power in other ways.