Where does the new Demiurg hype come from?
They might be important story-wise as they are travelling nomadic merchants and miners offering ressources, technology and spaceships to T'au but I don't see them having any pertinece on the table.
They are our non fighting space dwarves.
- More different Kroots (heck, they become what they eat. Shapers control their menu.)
- New Vespids, maybe a vehicle (something that's not a suit)
- Gue'vesa. I dislike this the most as I can't think of a role for them. T'au take auxiliaries for purposes their own doctrines can't handle. But for these there are already Kroots, Galgs and any other mercenary race. Anything Humans can do T'au are better at it or it contradicts the Tau'va.
T'au don't entrench. They fall back and then mont'ka all over you
- Nicassar...I am split...fluff would forbid this as T'au do actually hide these extremely formidable psykers. They are needed as navigators and who knows what happens if the Imperium would know they exist. But they would be great psykers on the table as they are fragile, slow and the only real race in the Empire with psykers.