I thought the troops produced depended apon the towns infrastructure for the most part? I experienced three revolts in my Scipii game. One was against me, Corduba revolted with a stack of Mimillo Gladiators and Peasants(Which was what I would expect, since it had only a Coliseum/Govenors buildings but real no troop producing buildings

I've also had two cities that got captured revolt back to me, and these only included troops that those towns could produce as well. You've also got to remember a revolt isn't only the city, is the entire region. They'll gather up townsfolk, mercenaries, slaves, etc... if they hate whosever taken up rule enough. You could also have a situation where people come from nearby regions to help, I mean thats seen often enough IRL.

But, this is just given my experiences, I haven't seen that many revolts so I don't know for sure if they don't rely on the towns buildings or not. The one odd thing i've noticed is that sometimes they'll be high experience units, higher then whatever bonuses the towns Temples/Barracks would give but that isn't that big of a deal.