I remember an EB member mentioning that there was once a unit planned for Epeiros for the third tribe of the city to be represented. Some kind of none phalanx, infantry unit.
The same faction used to have dedicated Illyrian versions of the Thureophoroi and Thorakitai but they were dropped since it meant they couldn't have the Hellenic versions due to various reasons and I guess they were more important.
Also mentioned that they would have liked a lighter version of the Thureophoroi but didn't want to give another slot to a very similar Hellenic unit type.
EB also said there was meant to be an armoured Balearic slinger that was never made.
We still don't have any kind of unit in Sicily to represent the native peoples, some kind of Peltastai
similar to the Lucanians I guess.
The EB 2 video had some Hellenic sword unit that looked almost like Kiarians. Not sure who they were.
That's all I got off the top of my head.