The Civilization VI December update, free for all Civ VI players, will add a city state picker and adjust various aspects of the game (including great people, policy cards, and secret societies) for balance. Players will also gain the ability to tell an AI civ to STOP ASKING for things. Discuss this update in the forums here.
The developers will show off the changes in a livestream on December 16; discuss the livestream here.
The update drops on December 17.