I KNOW I've seen a crystal drone out there somewhere before... I think CE adds them, but I'm not sure. I'll look around, and if I don't find anything, I'll make crystal drones my next priority.
So, CE does add in crystal drones, though, I don't really find much use in them, considering most of them are anti-personnel and lock-down ones. It could be interesting to have another concept of a crystal drone.