I really expected Microsoft to completely ditch Aero in favor of Metro. They did not. There's this weird mixture of the two user interfaces. I don't really like it. Windows 8 seems too tablet-focused. I like Windows 8 about as much as I like Gnome 3, which is to say not at all. Vista didn't give me reasons to upgrade from XP. I don't see 8 giving me reasons to upgrade from 7.
Why are we determined to unlearn all the things we've previously learned about desktop user interfaces? I really really hate the two-faced UI determined to waste screen real estate as much as possible. I can go on and on about the specific properties of the UI design that get in the way of me being productive. I'm getting the impression it would be easier to sit down in Flash and create a stupid little program to show what Windows 8 should have been. I can't see them making any usability-focused changes between now and final release.
Try again, Microsoft. You had great ideas, but you didn't implement them the right way.