I find it hard to imagine that the fleet carriers will provide any more gameplay than what exists already.
Ok, you can move the thing 500ly at a time and it carries all your ships but, ultimately, what additional gameplay would that bring that isn't there already? If you've got a well engineered exploration ship you could probably travel 500ly in less time than it takes to refuel the carrier. Ok, without a carrier, you can't mine when you get to whatever distant destination you've picked but you can mine in the bubble already without travelling far at all. It'll be like having a mobile station but there are so many stations out there anyway.
If they're bringing new gameplay with them that doesn't already exist then that's great but I'm sceptical.