In the history of Windows, there have been both versions that were considered to be completely new "revolutionary" operating systems (i.e. 95, NT 4.0, 2000, and Vista) and as well as refinements to existing versions (i.e. 98, ME, XP, and 7). Generally the refined versions of Windows were better recieved than the all-new versions. The only exception was Windows ME, which was a stretch too far for the old DOS platform.
So, does anyone think Windows 8 will be an all-new OS (i.e. NT 7.0 or NT 8.0), or will it be further refinement of Vista/7 (i.e. NT 6.2)?