I didn't realize Macedon and Scotland wasn't on the chart either. That being said I'm not quite sure I'd call Nubia an offshoot of I presume Egypt, like the others. At least I don't see any attributes of Egypt from past games getting put into Nubia unlike Scotland, whose cities have been Celtic city names, and Macedon, who obviously had the leader for Greece the past 5 games. Though I could be wrong and Egypt has had Nubian cities in the past.
That being said you could possibly make the argument that Nubia could be a "replacement" for Morocco. Of course it would somewhat be a stretch like the Shoshone and the Mapuche,. Both are located in North Africa and deal with gold/desert playstyle. At least it makes more sense than Georgia.
I'm still not 100% convinced until we see who the civ is in March though.
If we want the Pacific represented why don't we go with the Haida/Tlingit which would kill two birds with one stone being Pacific Coast/North America?
They even said on the Maori livestream that they looked over all the different Polynesian cultures and decided that the Maori would be the best group, out of all of them, to be in the game. That's why I'm not expecting any others from Oceania.
I don't know if that really matters to anyone else in the long run.