The first and only release candidate of Windows 7 is expected to be released in April 2009 according to a news post on wzor.net which are citing Microsoft sources. The OEM of Windows 7 is aiming for an autumn release while the final retail release is expected to be available at the beginning of the Christmas season.
The latest known official builds of windows 7 are build 7015 and 7016 that have been created on 4.1.2009 and 12.1.2009. Build strings for those releases are 7015.fbl_multimedia_media.090104-1750 and 7016.0.090105-1500.
