There's really only about 4 places current unoccupied by major structures that could potentially receive
something of substance over the years. Number #4 on the map I believe was a rumored Potter store, while #2 will partially be occupied by a pathway to an expansion pad. #1 is just grass, #3 is a small garden with a small kiosk that can easily be relocated elsewhere, doesn't sell anything interesting/unique.
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During the winter it should be fine, but I wish we got more seating areas like Epcot's central core did with built-in seating/tables and loungers. Outside of the restaurants, there's no major seating areas out of the direct sunlight.