The title is going to stay the same, it's just small (from what I was told) references to the Fox films being removed. I was also told months ago that there was a definite chance that TNM could be part of the MCU, that Disney wanted Anya Taylor Joy for example for X-Force (which, as of a few months ago, was still being developed I believe). And now, it's becoming even more of a possibility after Disney was really surprised by how well the screening went. Of course, that also depends on the BO return, but the film only cost 45M, so it's bound to make some serious coin.
That same person also told me Boone is finally happy with the film, and that the cut screened is closer to his original vision, more horror was added, secret reshoots actually happened (with Boone of course) at some point, the action is also bigger, the third act is bigger, so this is all very good to hear for those, like me, who are really excited about the film. Blame Fox for sitting on the film for so long, and then the merger adding to the mess.
May be wishful thinking, but I'd be ecstatic if we could end up seeing Boone's original NM trilogy happening. And it'd also be a cool thing to have them in their own corner of the MCU, have a really different, actually fresh and distinct feel to them, introduce mutants, and then have them crossover whenever they feel like it.