If I choose only which civs I would like to have in CIV7 the game would not be very popular.

So a more marketable and likely list would be like this:
-
Celtic slot: Ireland, this is very likely, just wonder if it would take the place of Galia or just Scotland.
-
Hispanic slot: Argentina instead of Colombia could be a nice flip.
-
South American native slot: In the same way
Muisca instead of Mapuche for a exchange in the continent.
-
Southeast Asia slots: Likely Siam would come again instead of Khmer, but the real new face could be
Burma instead of Vietnam.
-
French colonial slot: Maybe
Haiti make it as the first afroamerican and caribean civ.
-
Mesopotamia slots: These are difficult, Babylon is the big name, but Assyria is still a great option and Sumer have their "first civilization" attractive. Still
Akkad under Sargon could be a great reinterpretation.
-
Central/East Europe slot: Poland seems to be a new regular, but
Bohemia instead of Hungary is possible.
-
Central Asia slot: I think
Gurkani are a great option to cover the region this time, even with two leaders one for Timurid and one for Mughal eras.
-
Polynesian slot: Tonga, I hope here Firaxis show a real historical compromise instead of go again with the popular Hawaii.
-
North Africa slot: Is Nubia supposed to be their representative in CIV6? I mean even Carthage was Phoenicia this time. Anyway Dihya for
Berber civ would be great.
-
Subsaharan slot: I mean the second slot replacing Kongo, could be for so many options,
Yoruba is one of the best. For me is a shame that Zulu hoard one slot just because being one of civs originals.
-
North American native slot: Also many possible options but my favorite would be the the
Choctaw.
-
Anglo colonial slot: I guess Firaxis want to keep Australia if Canada is supposed to be french, still I think both in the same game were redundant. There are not many really new options after these two unless that they want to add
New Zealand.(would not be surprised if they do it)
From the regions that I think deserve and could gain more slots the most likely is Africa, if it happen I would love to have
Somalia. Beyond that I would like to gain more slot if we replace the second Scandinavian, the second Celtic (if Scotland count as it), the Anglo colonials (that are not USA obviously) and fuse the many Greeks but these seem very unlikely.