The release notes provide a history of the firmware update release dates.
I have no idea if the dev team is shared but here is the timing of the last 4 major releases across both platforms:
3/2019 — dlive
12/2019 – Avantis [initial launch]
[big gap, covid fun]
3/2021 — Avantis
9/2021 – dlive
Based on the history you might guess we could see an Avantis major release 6-9 months from 9/2021. But who knows, they don’t share their backlog or calendar with us.