Bridging the gap between the ages of antiquity, exploration and modern. AI will unlock the potential of other civilizations. These civilizations are contingent upon the chosen civilization from the antiquity era. For instance, you could start with Rome and progress to the Mongols if you have a surplus of horses.

Civilizations announced so far include:

Antiquity: Aksum, Egypt, Maya, Maurya, Rome Exploration: Shawnee, Norman, Chola Modern: France, Mughal

https://civilization.2k.com/civ-vii/game-guide/civilizations/

Check out this video when you have a spare hour.