As Windows 8 edges closer to release, we're seeing more and more new things leak out. Win Unleaked recently released some new screenshots of the freshest build of Windows 8, RTM build (8518).
It looks as though Windows 8 is taking on more of a square look, and ditching the curved window borders, Start menu and taskbar from the last two iterations of Windows (7 and Vista). First up, we have the original Windows 7 look pictured above, and the Windows 8 look, below:
It's not a big change from Windows 7, but it does look better in my opinion.