Technically it is. Windows 7 is actually Windows 6.1. Most of the changes are under the hood to streamline things, much like what Apple did with Snow Leopard around the same time.
Haven't tried Windows 8 yet but a lot of people are complaining about Metro and the simplified desktop UI. As usual, MS is late to the party as both Ubuntu and OSX have had something similar for awhile. Mind you Microsoft's does look better executed.
Metro is good for the mobile computing world, and will have little effect (after the initial reaction of people new to Win 8/Metro) on users who aren't using touchscreens.
Metro is just an added UI on top of Windows 7. Most of the people complaining about it haven't actually played around with Windows 8; you don't need to use the tiles, you can go to the regular Windows desktop UI we are all familiar with.
I can't wait to get a convertible ultrabook/tablet with Windows 8. I like the live tile scheme on Windows Phone, as well.
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