Oliver, your last summary suggests to me that I should let everyone know in a broader sense what's going on at Incubator right now.

I did a thorough review of Incubator in July 2017.  At that point in time:

• There were approximately 1,000 tests having at least one page of content.
• Of those, about 550 were either "substantial" (at least 25 mainspace pages) or "active" (had at least one mainspace page created on or after January 2016) or both. (Those are pretty generous definitions, I think.) The other 450 met neither standard.
• Exactly ten (10) test had fully met the activity requirements for approval:
  • Two were actually already approved, but had not yet been deleted from Incubator (Dinka Wikipedia and Dutch Wikinews)
  • Three have subsequently been approved and created (Bashkir Wikibooks, Hindi Wikivoyage, Fiji Hindi Wiktionary)
  • Two have been cleared for final language review (Ingush Wikipedia, Gorontalo Wikipedia)
  • One has met all requirements, but still requires discussion (Lingua Franca Nova Wikipedia)
  • The last two are not quite ready for approval yet on other grounds (Algerian Arabic Wikipedia, Atayal Wikipedia)
• I made notes on another 18 or so tests (as comments in the templates feeding Incubator:Wikis) that are "close to ready".  These either (a) had periods in the past that were active enough, (b) were just shy of active enough recently, or (c) have a lot of content, but too few contributors.