The GM release traditionally signals the last major internal update before the release to the general public; save any major issues, this version (labeled build number 11A511) of Lion be the one consumers will see later this month.
Lion still has no official release date from Apple beyond the nebulous "July", but we'll keep you posted for new developments. In the meantime, you can get yourself ready for the OS by reading our pieces on about Lion; ; and what to do if you're still running when Lion hits.