So what happened?
Microsoft realized Vista was crap, and now they create a "new" one?...
Vista was released in late 2006... by the time the new version is "officially" released, it will have been almost 3 years, which is right on track for Microsoft's roadmap of updates to their OS software.
November 1985 Windows 1.01
November 1987 Windows 2.03
March 1989 Windows 2.11
May 1990 Windows 3.0
March 1992 Windows 3.1x
October 1992 Windows For Workgroups 3.1
July 1993 Windows NT 3.1
December 1993 Windows For Workgroups 3.11
January 1994 Windows 3.2 (released in Simplified Chinese only)
September 1994 Windows NT 3.5
May 1995 Windows NT 3.51
August 1995 Windows 95
July 1996 Windows NT 4.0
October 1996 Windows 95 OSR2
June 1998 Windows 98
May 1999 Windows 98 SE
February 2000 Windows 2000
September 2000 Windows Me
October 2001 Windows XP
March 2003 Windows XP 64-bit Edition
April 2003 Windows Server 2003
April 2005 Windows XP Professional x64
December 2005 Windows Server 2003 R2
July 2006 Windows Fundamentals for Legacy PCs
January 2007 (retail) Windows Vista
July 2007 Windows Home Server
February 2008 Windows Server 2008
TBA Windows 7