Another possibility for saving land space could possibly come through a deal with the convention center. I imagine the existing convention center surface lots could be converted to garages and connected to Universal's new park through transit/people mover/etc if Universal is desperate for room. Hell, from what I've seen, the huge convention center parking garage on destination parkway is barely open, just for a few events at the convention center a year, since they generally use the surface lots first. I'm not sure why they built that garage so far away from everything. Lets not forget Universal also picked up a number of parcels large enough for hotels around the convention center as well... I think that surface lot and remaining empty space is being reserved solely for dry park 4, no parking, no hotels, in their long term plan.