I question whether they actually have the space for all of those things mentioned (outside of the new Theme park that is under construction). Based on the shape of the land they own in that area, I don't see them being able to build all of that, unless they also can somehow buy the big chunk of land owned by Lockheed Martin.
Attaching the image that was posted on Page 28, the majority of the Central purple area is being taken up by the New park and potentially connected Hotel. Then from there you have oddly shaped strips of land that I don't see being large enough for another Theme Park. The upper right purple area *maybe* could fit another park, but it puts it in an odd location. So *maybe* they squeeze another water park there. Dunno.