Windows 7, (formerly codenamed
Blackcomb and later
Vienna) is the working name for the next major version of Microsoft Windows as the successor to Windows Vista.[3] Microsoft has announced that it is "scoping Windows 7 development to a three-year timeframe", and that "the specific release date will ultimately be determined by meeting the quality bar."[4]
Windows 7 will ship in both client and server versions with the client versions available in both 32-bit and 64-bit editions.[4] The server version of Windows 7, Windows Server 2008 R2 [5], is 64-bit only.[6]
Little is known about the Windows 7 feature set, though public presentations from company officials have disseminated information about some features. Leaked information from people to whom the Milestone builds (M1, M2 and M3) of Windows 7 were provided also provides some insight into the feature set.
more on
wikipedia
some screenshots can be found
here