Jep 20 attractions and is done can build just very small park found out with free version so it saved me a lot of money not gonna buy this crap !!I am not sure if they will or will not. The issue is the CPU/GPU in the PS4 Pro. There is a lot of physics and game logic running the game. You have all the rides, then you have the scenery and then you have all the AI running for the pedestrians and the staff in the park. It is a lot for those consoles that have a very old Jaguar CPU.
On the next gen I believe they should be able too. You get about 25% more building on Next Gen. I think they should be able to push that a bit being the CPU in the next gen consoles are modern CPU's.