Decided to check this one out! DOWNLOAD IS HERE: windows.microsoft.com/nl-nl/wi…
First impressions: it seems to be quite good, the installation only took about 8 mins (on a VM), snappy and fast from the looks of things. I like how you can resize the startmenu with your mouse now, and the expose feature looks cool, better than that silly, gimmicky Flip 3D they had in Vista.
I do think it needs some work, particularly on the visual style bit. Seems too much like Windows 8, I hope MS will change it.
Comments are welcome!
Oh and make sure to check out my Windows "9" 10 concept, I might update it a little soon: