I’m hoping that there will be more NPC civ types
‘minor civilizations’ for empires and nations which could be civs in-game but haven’t been picked for space (Mali/Ghana if Songhai is chosen, for example), or empires/peoples which are significant but don’t have a language to use (Mississippians, Olmecs).
‘city state’ for nations which are only significant for one city: Singapore, Bandar Seri Begawan or nations which can be represented through one city: Havana, Port au prince, etc.
‘nomadic nations’ for pastoralist, semi-pastoralist or hunter-gatherer peoples such as the Inuit, Saami, Ainu, Khoisan, specific aboriginal australian groups, Andamanese, Huns, Scythians etc. who wouldn’t fit the concept of a civ but are historically and culturally important enough to be signified in some sense. Their relations with city states, minor empires, each other and playable civs would depend on their historic interactions with larger empires: warring, uncomfortable peace, isolationist, autonomous, semi-autonomous, incorporated with cultural independence, etc.