Windows7 has been signed-off and now goes into RTM. See the video below where contributing development teams give their go to release Windows7.
Windows Engineering blog – RTM announcement
http://blogs.msdn.com/e7/archive/2009/07/22/our-next-engineering-milestone-rtm.aspx
Windows 7 Team blog – When will you get Windows 7
http://windowsteamblog.com/blogs/windows7/archive/2009/07/21/when-will-you-get-windows-7-rtm.aspx