"sales at pine64 dot org" informed me that there are no plans to produce Rock64-1G or Rock64-2G version 3 for now.
I left this community in Aug 2019 due to PINE64 refusal to produce/deliver ROCK64-1G version 3 after more than one year of changing statuses to "planning", "evaluating", "releasing", "availability", "estimated availability" and finally "no schedule" . ROCK64 is dead platform without any advantage. Buy Raspberry PI 4 !