Henri Christophe
L'empereur
Also, we have enough European civs. Portugal is arguably the last fit that is acceptable to me personally. The consumer base will probably force more in though. If we're going by some South Slavs, which is what's most needed atm, I agree that Bulgaria is a great choice.
In a way, I'm sad they added Ethiopia, because it probably means no more African civs. I have a dream of some day seeing a Swahili civ, based around their incredible participiation in the Indian Ocean trade. A Pagan African naval trading civ? Yes please. Tibet would also be amazing, but with all gaming companies trying to get into the Chinese market, I don't see it happening...
In that I agree, this game have too many europeans civs, it's already enough.
I don't want also Swahili, they can easily come as a bunch of city states, I would argue about some Atlantic African civs as Ashanti, Oyo, Dahomey, Benin and Ndongo as next civs. (Chad or Zimbabwe also should be cool).
From theses civs, the best is Dahomey because the Amazon warriors Ahosi (Mino). Because it will be the first unique unit female, it should have +10atk against male units.