The great news keeps coming for Anbernic's RG351V. They surprisingly (and correctly) started sharing source codes with developers although they waited until the device was already launched but the system is getting a lot of developer support now.
ArkOS was previously announced as no longer supporting the RG351V but it looks like the developer has changed their mind. This is awesome news!
I'll be keeping a close eye on further developments. In the budget realm as long as you like vertical handhelds and don't need a right thumb-stick (most people don't), the 351V is an excellent buy.