Since it sounded like jQuery was an option for Metro JavaScript apps, I was starting to look forward to Windows 8 dev. I installed Visual Studio 2012 Express RC and started
For what it's worth, I've ported the majority of jQuery core to wrap the native WinJS library. It's lightweight and provides just about everything that jQuery does with the addition of some plugins for badges, notifications, etc.
It is a work in progress, but I'm trying to get some people to join in the fun.
https://github.com/rmcvey/winjq
Quick write-up (documentation is being added to): http://practicaljs.com/jquery-in-windows-8-apps/