This is the biggest update so far by several magnitudes.
Update -
Civilizations -
Antiquity Age Civilizations [Egypt, Greece, Maurya, Persia];
Age of Exploration Civilizations [Abbasid, Chola, Mongolia,Songhai, Spain];
Modern Age Civilizations [Mexico];
Leaders [Isabella]; Leader Attributes;
Independent Powers & City-States [Damascus, Shangjing, Tonga, Vilnius]
Cities -
Buildings [Bazaar, Dungeon, Gristmill, Guildhall, Inn, Kiln, Lighthouse, Sawmill, Shipyard, Stonecutter, Temple, Observatory, University, Wharf];
Great Works [Relics];
Wonders [El Escorial, Hale o Keawe; Shwedagon Zedi Daw, Tomb of Askia];
Technologies [Astronomy; Cartography, Castles, Feudalism, Guilds, Heraldry, Machinery, Shipbuilding]
Civics [Authority, Bureaucracy, Citizenship, Colonialism, Diplomatic Service, Economics, Future Civic, Imperialism, Inspiration, Mercantilism, Piety, Social Class, Society, Sovereignty];
Social Policies [Castes, Hospitality, Commodities, Commune, Conscription, Drills, Literature, Maritime Law, Medicine, Renaissance, Scholars, Trade Winds, Vassalage];
Units [Ranged; Cavalry; Naval];
Commanders [Fleet Commander]
The Map -
Terrain [Tiles; Vegetation, Wet];
Natural Wonders [Redwood Forest, Thera];
Resources [Cocoa, Dyes, Fish, Furs, Kaolin, Niter, Pearls, Spices, Sugar, Whales];
Discoveries;
Geographical Features [Continents, Rivers, Volcanoes];
Disasters [Volcanoes];
Map Types [Archipelago, Continents, Continents Plus, Terra Incognita, Shuffle];
Game Mechanics Eras [Crises];
Diplomacy [Espionage];
Governments;
Faith [Pantheon, Religion]