Honestly, this can’t be repeated enough in this thread. If we should get only two more new civs, which I really hope not, the focus should be far away from Europe.
With only 2 new civs to add without adding a completely new architecture set, I’d probably just add two South Asian civs and focus on giving them the last missing graphic assets they’re missing like an unique King, unique sails and probably some unique trade cart models too.
Alternativelly afterwards the focus should be in Africa and America.
I’ve already mentioned this in another thread:
https://forums.ageofempires.com/t/suggestion-unique-south-asian-indian-sails-and-king-graphics/
https://forums.ageofempires.com/t/south-asian-king/
I’ve heard of the Falcon warrior:
I’ve made some concepts in another thread:
https://forums.ageofempires.com/t/a-new-world-dlc-suggestion/