I am surprised a French company would leave out Les Gaulois. Oh well, I'm sure they'll come in DLC.
As we now know 7 classical cultures (Aksumites, Carthaginians, Goths, Greeks, Mayans, Persians, Romans), I'm guessing the last three are Magadhan (i.e. Maurya and/or Gupta), Tiwanaku (fingers crossed!) or Moche, and yes... the Han (the picture of two men playing go.)
The 7 known cover, geographically, the Mediterranean like a blanket (Rome, Greece, Carthage), central America (Mayan), Middle East (Persia), eastern Europe (Goths), Horn of Africa (Aksumites). Some of them are also 'natural' extensions of the Ancient/Bronze Era Factions:
Nubian - Aksumite
Phoenician - Carthaginian
Mycenean - Greek
Babylonian - Persian
So, what's left Uncovered in Classical: East Asia, South Asia, central Asia, Northern Europe.
South and North America are real Long Shots: I don't think a South American Faction is an impossibility, especially if they follow up in Medieval or Renaissance with Inca, but any North American Faction would be a stretch: Cahokia? Puebla/Anasazi? and there's little or no 'follow up' Faction possible.
In East Asia, as stated, the Han leap to mind: long-lasting, could be Militarist or Expansionist or even Agrarian, so could fit a number of empty 'slots'.
In South Asia, it's really a bit early for anybody from the southeast, so the Mauryan or Guptan Indian Factions make sense - and also provide a Follow On to the Harappans, and could be, again, Agrarian, or Expansionist or even Aesthete with a little cutting and bending at the corners.
Central Asia cries out for Something. This was the Era (1000 - 800 BCE to 500 CE) when the first of the great Mounted Pastorals appear: Scythians, Xiong-Nu, Huns, Sarmatians, and if they are not going to have a specifically Nomad Faction for us, at least to cover the area geographically would, I would think, be a consideration.
And we still have that enigmatic 'Hun Horde' spotted on one of the Amplitude boards that has not been explained. IF it's not a Special Mechanism or Minor Faction, it's got to be associated with a Central Asian Faction of some kind, and if it's an early Code or Cover Word, it doesn't even have to specifically mean Huns.
Northern Europe. IF it's not Celts, there's not much else left. The Germanic tribes were numerous, but totally without cities in the Classical Era - and almost as 'nomadic' as the mounted groups further east. Britons all the way up in the islands have so much Celtic influence already that it would be a chore separating them: you'd be far better off going with the established and fairly well-known Celtic Gauls of Vercingetorix, Dumnorix, Asterix and Getafix. Shucks, between Druids and Nematons Oppidum and Menhirs half the graphic and Emblematic work is already done for you!
