It seems they have settled down to annual (August) releases now; so the next one may well be "imminent".
They have also teamed up with various Big Names a couple of times .. KitKat
(2013) and Oreo
(2017), for example.
I wonder who it will be (was) for Pie
Meanwhile, is Datrend doing anything about RFID (different topic)? - Android (and Wi-Fi) could be useful there too.I have an old (and largely useless) Jelly Bean (2012) tablet here.