Personally I'd be interested in seeing the Koinon made a more involving experience. Right now it seems too tight and solid, detracting from the differences between members. It would be interesting to have one city playable with the others being gained (or lost) through missions, but I guess that would require a lot of scripting.
Personal faves for new factions? Syracuse, a Numidian kingdom, Pergamon, Bosporan Greeks, Massiliotes (though I guess they're unlikely but I like their Greek-Gallic thing), a Belgic tribe, another Germanic tribe (either Lugii or Basternae would be great), and Goidils. Some Celtiberians and Illyrians would be nice, too, but I don't know if they'd be enough unified.
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