All unit tests run green on all supported database.
The engine is as stable as v5 (and if you ask me, stabler)
"It'll be soon 1 year since Paris conference"
Sure. But we've kept supporting/maintaining/enriching v5 at the same time. We could have not done that and it would have been ready, but we didn't want to have a full stop for the project.
We're currently 'finishing up'. We're rewriting a big part of the job executor which we want to get into the v6 for the first release, which should improve performance. There are a few performance fixes going in too. It's done when it's done, but it shouldn't take us much more months.