There will be a Divinity 3 to conclude the story arc of Damian and the Divine One, at some point. The details of the design will likely not be decided until development actually starts.
Larian's next projects are using the D:OS engine.
Personally, I hope real time combat support gets added to the D:OS engine and more dragon knight RPGs get made (I like turn based combat, but don't see how it would work well with dragon flight).
