The real question though is the issue of microsoft not allowing self publishing. I find it hard to believe they would require a publisher for win 8 apps. It might turn out to be the new xbox live indie games section.
I honestly have to wonder though if node webkit exported exes could run on the thing. A lot of the games at e3 were running on win 7 pcs.
Still, it appears that the only one who hasn't come out with support for web tech on their system is sony. C'mon sony, support html5 for games!