Looking at the backstage area, restaurant has already got its plot of land set aside (black), as does M&MRR (red), but everything else is negotiable, and we know Disney is looking at using as much backstage real estate as possible for expansion. Now, who knows exactly how much more they can push into having the park take over buildings back there, but I would think the green and yellow is more likely, while all the blue is unlikely. So I'm thinking a walkway (orange) near some new shops (green) leading to the 3rd ride (yellow) , but maybe they go even crazier if they dip back there even further (blue).