Out of pure curiosity...

[Tellos Athenaios]

Well there are province descriptions for that kind of thing. Unit wise you shouldn't expect much, certainly not for the first or second release: Etruria is undoubtedly a fascinating regions with a strong expression of its local culture *but* like on Sardinia it is already occupied by a major power (which is going to take precedence over a the quirks of a region) and on its own it will never be more than a mildly interesting rebel province.

[Arjos]

on its own it will never be more than a mildly interesting rebel province.

Of course, I wasn't expecting anything more than that, just something to show their presence along the roman side and also for other factions, as natives tried to fight against the Romans in many occasions...

But the language! It seems related to Rhaetian

Following the celtic migrations of the 4th and 3rd centuries BC into northern Italy, the etruscan "merchant outposts" were cutoff from the peninsula and so the colonist settled in Rhaetia...