"The full Windows OS"?
So which version of Photoshop, Call of Duty, and all those other Killa Appz® will this "full Windows OS" run ... on an ARM processor?
Face it, the forthcoming "Windows" tablet will just be "Phone 8", and the nearest thing it'll have to a Killa Appz® is a game of magic squares pretending to be the GUI.
As for Fedora or any other "desktop" GNU/Linux distro on a tablet ... certainly, if you can find a suitable touch-oriented UI. The current crop of KDE4/Gnome3/Unity UIs seem promising in that respect, but there's still far too much typing required IMO - for a tablet, anyway. Until such time as they've been more refined for tablet use, the existing phone/tablet UIs are far more suitable - even the pig-ugly Metro. I'd run Gentoo on a tablet in a flash (ho, ho) if I thought the UI experience would be usable on that medium, but it isn't IMO, so until it is I guess I'll stick with Android
Although, now that I think about it, MythTV, XBMC or any of the usual "10 foot interface" UIs might actually be OK on a tablet.
Canonical recently made an announcement about better support for tablets and Smart TVs, so they're probably the ones to watch for a good GNU/Linux-based tablet solution in the near future - no doubt based on Unity.
But "Windows" 8? I've heard a lot of comments from even die-hard Windows fanbois who think it'll sink like a brick. Apart from the fact that it's hideous and looks like a kindergarten toy, it ain't really Windows and won't run Windows software. That'll kill it stone dead. If Microsoft's lucky it might pick up the 0.66% it currently "enjoys" in the Phone 7 market.
The only thing that might save "Phone 8" is if Microsoft "pulls a netbook", but the market conditions are completely different to that last "phenomenon". ARM ain't an x86 architecture that Microsoft can just waltz onto with a resurrected relic, and the OS it needs to usurp isn't something unknown and unfamiliar to the masses. We have Android now. IMO that's game over.