To me the cult of Lud are all about a head figure that started his own religion that is as follows: I see the end but i can build an empire that will stop it, all we need to do is kill those that oppose us and take there supplies to feed the empire. Kind of like a bunch of people following some crazy guy (a good example of this is in the syfy movie the Mist). And they have powerfull weapons, but really risky as they just strap as many weapons as posible to there ships because they have no "real" scienests like Tri and Hegmony have. They are probobly the size of tri fleets but not as tough, but tougher than pirates or hegmoney of the same size. Also maybe there are those that kill others constantly and those that believe in peace, but have the same porpose.
Just my thought from the small info i got from this:"I know what it’s going for, something like a faction of deep-green militaristic primitivists who want to return everyone to a state of nature – by force. Not quite the Sid Meier’s Alpha Centauri Gaians, not quite the Sid Meier’s Alpha Centauri expansion’s Cult of Planet, but they all probably hang out at the same coffee shop, with Lud being the creepy one that sits in the corner polishing their guns."
The other way i take this is they are advanced, not as much as the tri but enough that anyother small fleet is scared to look the wrong way at them. Same ideas they have but they just use less weapons, a Destoyer of theres can 1 shot a overloaded frigate. they just blink at small fleets and they go POOF! either way i cant wait till there added