Very Mad Max
Chieftain
From Wikipedia alone it seems hard to put any sort of profile together. They were good at weaving and after the Spanish arrived became skilled with silver. Maybe some sort of trade bonus?
They had a religion which seems enough for Firaxis to give religious bonuses
They rebelled against the Spanish so maybe some bonus to defending its borders?
The wiki article mentions they were known for their "Clava" hand club which makes me think they'll get a warrior replacement.
Their Chemamulls were giant funerary statues made from wood and marked the graves of the dead. Perhaps a UI and gives faith/culture
Oooo, it would be cool if they did something similar to the Quecha from civ 4.