There's at least some plans for how we kind of handle it: see special weapons that require power armor to operate as effectively as possible, etc, but very little else so far. I wanna do something simple early on (see: 'smashing some content together to plug into space combat, once the ~example fites~ for space combat function) in the Giant Fuckhuge Plans Of Oh Fuck so we'll see what happens I guess.
I kinda feel like I want to split the concept into multiple versions, and use 'power armor' more as 'augmented armor' with a couple of different lines that it could take; explicitly so we might have something that would fit the kind of things the different player classes play on. Or maybe 'power armor' explicitly refers to one
type of augmented armor, that kinda thing.
We'd have the big, bulky war machine type thing for Mercs; something designed to enhance their physique (which, by extension, allows them to wield heavier weapons). "I maek u stronk"
Something light-weight for Smugglers; either designed for enhanced speed or reflexes, something of that nature. "I maek u fast, steady."
Techs I'm not so sure on. Playing into an amplifier of some sort might work; like a giant, mobile reactor that feeds into all the things they use. More power = more gooder shields, higher energy weapon damage. "I maek u powerful".
That, at least, would be the basics. I wouldn't restrict these to each class or anything, but that would be the underlying design paradigm of three different directions that could be taken as a basis.