Usually non-test builds are released either bi- or four-weekly on even weeks. Rollout seems to start end of the week or starting the following. I.e. .26 started rolling out only in at least week 27 or later (according to ev-fw). Dot-releases like .26.2 can come later, like rolling out in week 30.
Today we're in week 31, so we might start seeing .28. Personally I think that's unlikely as we just got .26.2 last week. It might be another 2 weeks until we see any new version numbers.
Next time hopefully with some of the long overdue functionality and not niche, unasked for stuff like the limiter or the party-camper mode. Heck, full AP1 feature parity is still not here, 20 months and counting! Most prominently sign recognition.