Honestly, I doubt they will...
What so far has been announced is some fleet comms, and the ability to acquire a fleet carrier. That's really about it. They even said "we don't know yet whether or how we'll tie this to BGS and minor factions", i.e. after thought.
Some speculation on the FFF threads have gone as far as ask for a BGS reset.
None of this is going to happen. I think the closest you'll get to BGS/minor faction integration is that you can name your squadron the same as a minor faction, but no actual link exists.
So, "fake" faction pledge. I reckon that's all the BGS impact we'll see.