Just to provide further details, Vaadin 17 is already out and it is not getting any new features… and the train for V18 has left (GA coming out in Dec.). So like Denis said, the current work is aimed at V19 (GA March 2021). We most likely then backport it to a V14 minor release after that, but no timeline for that yet. The earlier we get feedback on OSGi support in V19, the earlier we can backport it to V14.
We will make some announcements once the work is done for V19 and you can test the OSGi support there. Current forecast shows that this happens earliest before holidays in December but no later than mid-January.