Galaxy Defender
V.I.P. Member
Universal was required to use materials from all the books despite all the books not being out when hogsmeade first opened. Since Rowling originally planned on doing nothing after Deathly Hallows I doubt that anything after like FB was included in the deal.I'd imagine that FB is under the same deal as HP. I don't think it matters if they use it or not.
Personally, I think HP at the current resort and FB at the new one is the best route to take to keep them as their own lands.
I would suspect that to use Fantastic Beasts would either require a new deal or an amendment to the old one. This would likely require an entire land with the expansion ability in order to accommodate all 5 movies