Old news maybe. However I hadn't seen the engadged report with the live video so thought it was worth a post.
As I posted in another forum, I think if x86 atom phones start to gain momentum, with windows 8 imposing some sort of standard platform (read APCI for power management etc) then this could become the future. Even with arm phones/tablets I read the windows will be imposing some hardware standards.
Hopefully this would do away with the heavy software optimisations mentioned in the video and allow respectable performance on any standard phone platform.