Ok, so i collected screencaps of royal houses techs and ability, the screencaps are taken by Aussie Drongo stream, and he was using the italian civ, so every tech give a vill, and some tech are affected by already researched techs… Said that here is the list:
House of burbon:
In my opinion, the presence of Jagiellons and Vasa Royal Houses tells us that a Polish-Lithuanian civ may appear in the future.
The same is true of the House of Oldenburg, who can announce the arrival of civ Danes.
The absence of the House of Hohenzollern may mean the coming of the Prussians civ in the future.
Besides, it would be nice to see Ukrainians (Cossacks) civ.
The Austro-Hungary civ would be nice to see, but the Germans civ along with the House of Habsburg is reasonably accurate.
I look forward to seeing more Royal Houses in the future and more Unique Units for them. I think that with the next European DLCs, the number of European maps and Royal Houses should increase so that Europe would be covered in such a way that everyone would be satisfied. Potential new Royal Houses for European Maps:
House of Ascania - Anhalt, Saxony, Brandenburg, Saxony-Lauenburg, Lüneburg
House of Nassau - Netherlands, England, Scotland, Luxembourg, Orania, Nassau
House of Luxembourg - Holy Roman Empire, Austria, Bohemia, Hungary, Croatia, France, Luxembourg
House of Rurik - Ruthenia, Russia
House of Romanov - Russian Empire
House of Stuart - Scotland, England, Ireland, Great Britain
House of Medici - Italy
House of Savoy - Italy, Spain
House of Ottoman - Ottoman Empire (more focused on the European part of the Ottoman Empire)
With these 9 brand new Royal Houses, Europe would become Minor Nations complete.