It'll probably keep it's name but it'll be sold as their next main thing, so to speak, leaving FFXV further to the future.
I wonder when we're going to see it though. SE could surprise us and deliver this holidays, but who knows.
As for exclusivity, I'd say is a 50/50 chance. Multiplat is very appealing these days, but most of their userbase is PS-bound. And very expensive games like Too Human held on to their exclusivity status even after crap sales.