To my understanding the mandrills are going to be taking over the current gorilla exhibit when the new one is built. The last master plan I saw had the unused land next to PCA being cleared and a new exhibit being built there. But it also has been mentioned here that the rhino lot might be another option. I would think the netting is a fast renovation that will be part of future plans and also adding an added precaution for the zoo when were living in a world where no-one is responsible for their children or their own actions.