Considering the past releases of DLCs and expansions of Civ6, we can all agree that Firaxis is not the best at keeping their secrets. This time is no different.
A pre-order article from Polygon has pretty much confirmed the first 4 civs and 2 leaders which will be included in the Crossroads of the World Collection (slated to be released in or before March 2025):
- Great Britain
- Carthage
- Bulgaria
- Nepal
Leaders: Ada Lovelace, Simon Bolivar
https://www.polygon.com/pre-order/516140/civilization-civ-7-sid-meier-sale-where-to-buy
It is not an official confirmation from Firaxis, but it's very hard to believe that a major news outlet would post false information about a release that's just a few weeks away. They didn't say it was a leak, it was posted as plain fact.
Later, a datamine from EGdata (basically SteamDB but for Epic Gaming) confirms the leaders and civilizations leaked by Polygon, and also unofficially confirms the last 4 civs and 2 leaders which are slated to be included in the Right to Rule Collection (planned to be released in or before September 2025):
- Dai Viet
- Silla
- Qajar
- Assyria
Leaders: Genghis Khan, Lakshmibai.
https://egdata.app/offers/e54fe70dd19243069a341316310a1daa/related
Since we launch with 31 civs, divided into 3 ages as 10/11/10, it is reasonable to expect 3 Antiquity, 2 Exploration and 3 Modern civs to be added next, and the 8 civs confirmed seem to make sense in this regard:
- Antiquity: Silla, Assyria, Carthage
- Exploration: Dai Viet, (Nepal or Bulgaria)
- Modern: Britain, Qajar, (Bulgaria or Nepal)