One is a collab with More Civs (is it a civ that they've already revealed, but your involvement in is not known? I'd assume 'no'), and one is reusing assets from another/other game(s). Both are yet aren't in the Americas, which would imply island nations like from the Caribbean though not necessarily, but they're not joke civs (so something like the North Pole with Santa as leader is definitely out).
I don't know what to make as a guess, haha, so just recapping the above.