Windows 8 has some really nice ideas and concepts in there.
Depends entirely on how well they will be implemented again.
Also, seeing how it's supposed to work on ARM stuff, they had to have made sure it uses much less system ressources.
I have heard rumors of windows 8 needing 50% less RAM compared to win7 for example.
Which is always a good thing.
And if they can get it to work propperly on portable devices so one can install windows software(java, megamek on tablet, here i come!) on them, all the better.
And maybe they will use it as the OS on their NextBox too. If they can really get it set up like this, then they will have a unified system for Console, Portable and Desktop.
Also, the System-Reset and Refresh Options are nice to have.
The Metro UI is, as far as i know, only able to be switched off by editing the reg a bit.