So, here is the updated list of the spotted City-States.
Amsterdam - The Netherlands (2nd revealed R&F Civ)
Antananarivo - Madagascar (appeared in Mongolia and the Netherlands livestream)
Armagh - (Northern) Ireland/Celts (appeared in the Cree First Look)
Auckland - New Zealand (appeared in Mongolia and the Netherlands livestream)
Buenos Aires - Argentina (appeared in Korea livestream)
Brussels - Belgium (appeared in Korea livestream)
Carthage - Carthage (appeared in India livestream)
Geneva - Switzerland (appeared in Korea livestream)
Granada - Moors/Al-Andalus (appeared in the Netherlands First Look)
Hattusa - Hittites (appeared in Korea livestream)
Hong Kong - Hong Kong (appeared in the Full Details video)
Jakarta - Indonesia (DLC) - replaced by Bandar Brunei - Brunei (appeared in the Full Details video)
Jerusalem - Hebrews, Israel
Kabul - Afghanistan (appeared in Korea livestream)
Kandy - Sri Lanka (appeared in Georgia First Look)
Kumasi - Ashanti (appeared in Georgia livestream)
La Venta - Olmec (appeared in India livestream)
Lisbon - Portugal (appeared in the Cree First Look)
Mohenjo Daro - Harappa (appeared in Chandragupta First Look)
Muscat - Oman (appeared in Korea livestream)
Nan Madol - Micronesia (appeared in Georgia livestream)
Palenque - Maya (appeared in Mongolia and the Netherlands livestream)
Preslav - Bulgaria (appeared in Korea livestream)
Seoul - Korea (1st revealed R&F Civ)
Stockholm - Sweden (appeared in Korea First Look)
Toronto - Canada
Valletta - Malta (appeared in Korea livestream)
Vilnius - Lithuania (appeared in Mongolia and the Netherlands livestream)
Yerevan - Armenia (appeared in India livestream)
Zanzibar - Swahili (appeared in Korea livestream)
CS Replacements:
Antioch - Byzantium? (appeared in Mongolia and the Netherlands livestream)
Babylon - Babylon (appeared in Mongolia's First Look)
Jerusalem - Hebrews, Israel
Toronto - Canada
CS Replacements:
Antioch - Byzantium? (appeared in Mongolia and the Netherlands livestream)
Babylon - Babylon (appeared in Mongolia's First Look)
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