I know I'm pretty much a caveman (and a minority) in this sense, but I really like the old, classic, sober windows 9x look and feel, so much that I doubt I'd use a new version of Windows that wouldn't allow me to use it. I'd rather do away completely with Modern UI in the desktop, but it seems some people like it; the more config options given, the better, at least for power users.
As far as I can tell this is "just" another way of pushing Metro. Excuse me: the interface formerly known as Metro.
"Oh, people complained about us forcing Metro. So let's introduce it more gradually!"
Personally I think it might be a good idea. It seems like a reboot of what Microsoft was going for with the Windows Sidebar (or the Start screen, obviously) in a format that actually works with desktop Windows's overall UI paradigm.
The basic premise of W8, if you ignore all the window-management stuff, is that they put your sidebar widgets inside your start menu, and made that your desktop (thus also obviating desktop shortcuts.) They may have implemented it horribly, but if the W8 start screen was the desktop--if your taskbar and windows displayed on top of it--I think it'd be the perfect UX for a desktop.
Some people missed widgets. By W7 widgets were pretty much dead.
I hope there is an obscure setting somewhere that would disable metro completely. As a programmer I see no benefit to it.