Pointe Orlando, right down the road from Site B, looks to be making significant redevelopment.
Pointe Orlando to Undergo $32 Million Redevelopment
Side note, about further expansion beyond the third theme park...
I think it's reasonable to say "does it look like they're planning for more?" Look at Beijing where this answer is obviously yes. But Orlando site B is tougher... I think the only reasonable discussion for this thread is "what is this land used for?" And the answer right now is "we don't know" for most of it. We know back of house operations, FW, and the parking lot. I'm eyeing some of those other plots for future garages, so if they start building hotels instead then that sparks a lot of discussion.
As far as what IPs/etc, that's silly and needs to go to the blue sky for sure, but even there I think discussing what IPs for the next next park is not going to be received well.