Microsoft Security Essentials Version: 1.0.1407.0
Antimalware Client Version: 2.0.5612.0
Engine Version: 1.1.4903.0
Antivirus definitions: 1.63.1710.0
Antispyware definitions: 1.63.1710.0
Here is the version that I am currently using. I have received no notice from Microsoft concerning GA. As far as I know, the status is still beta. It does seem to be quite stable, not "in your face", yet it offers active protection. Warns you before downloading something that many others would require you perform a manual or scheduled scan to identify. So far, I'm liking it.
Microsoft Security Essentials Version: 1.0.1500.0
Antimalware Client Version: 2.0.6212.0
Engine Version: 1.1.4903.0
Antivirus definitions: 1.63.1710.0
Antispyware definitions: 1.63.1710.0
Have just been updated to the version shown above. No indication that this is a final or GA version.
edit - FYI to whomever is questioning: Security Essentials that is downloaded from "alternative sources" does update just as when downloaded from Microsoft site.