I just noticed the Sitecore Q&A proposal has been in Beta for 891 days, when is it going to be approved as a full member of SE? and what are the requirements to get out of Beta?
A simple question with no simple answers :-)
For starters, see the discussion here: Should we rename or remove the "beta" label?
But the general indicators are:
1) Needs to have a healthy active community so proper moderator elections can take place 2) Needs to have 10 questions a day consistently
Additional information here: Graduation, site closure, and a clearer outlook on the health of SE sites
As far as Sitecore Stack Exchange goes, we are definitely at or very near the graduation point.