I roughly read all questions here, but one information is still missing for me. What are the criterions for GL&U to leave the beta phase? Is it a special amount of questions or users? Is there a general plan; e.g. until the end of this year?
See the Area 51 proposal page (linked to from the top page): http://area51.stackexchange.com/proposals/18413/german-language-usage
This site is in Public Beta
Anyone can participate!
The site's progress will be evaluated in 74 days.
Every new stack site goes through a 90 day beta phase, at which end it will be evaluated. You can see the criteria for what's considered a successful site on the aforelinked page.
If it is really unsuccessful, it may simply be killed. If it's so-so, it may stay in perpetual beta until interest picks up.