My personal take of it is that is probably a good thing, most folks complained about it anyway. Everything from slowing down their PC's to overheating their GPU's, and it would never blend in with the new Metro Interface.
Window Blinds (Stardock) will most likely an alternative solution if you want to restore it. If you think about it, this is exactly what made Windows 3.x through 95 so popular. Microsoft published the API, and programmers wrote their own code (much like today's very popular
That's my $0.02 anyway