Well it looks like FTM passed a restricted beta and is expanding TreeSync to a couple thousand more testers Monday, 19 JUN 2017.
Their notes specifically state that they do not use GEDCOM (presumably some sort of XML / XSLT code generation solution that's more compatible with databases).
According to some of the commentary, it handles media sync properly on all endpoints (multiple people / multiple computers) transparently.
Presumably the RM 7 team will act soon after FTM is stable.
So the choo-choo is coming 'round the bend.