So I was right. Its basically RTS/RPG mix with some arcade dragon flying, at least in battles (TBS on map?). It could be fine, especially when it expands old history of Divinity universe.
BTW The description actually reminds me of
King Arthur: The Role-playing Wargame from Neocore. Its basically similar TBS with RTS battles and strong RPG development of knights and quests. And the world is mythology/fantasy mix. Maybe someone from Larian played it (secretly at work

).