A lot of signed, without saying what they want to happen, so I can only assume it's proposal 1. Look at it realistically there's is no way, given how close we are to release, that FD are going to change that much of the structure they have already put in place. It's just not feasible.
Now if they had of communicated this back when the Exploration FFF was supposed to have originally gone live then we might have had time to convince them to make a change along these lines, but alasy they didn't.
I think it's pretty clear that they have plans already for the regions they have set out and, as has been suggested, they will tie in to things that are already in place within the Codex. So asking them to change the layout, or the naming is not just as simple as changing the wording on the Galaxy Map. Just on a side note, I hardly think we came up with the concept of calling parts of space regions.
As they already said this view would be a toggle my proposal would be to implement the GMPs map as a view that can be toggled on and off. That way FD don't need to change anything with the work they have already done, and we can still use the names we made and refer to them as such (if wanted) when creating expeditions.