In think the Mark2 dev-team moved from the RK3229 to Pine H64 in late summer 2019 and they are also evaluating the RPI4.
https://chat.mycroft.ai/community/pl/n9phc1qq1fgy7j6fqjymwko4qh
https://chat.mycroft.ai/community/pl/od1u133bsbb6ib34h3gp7w81eh