Corless threw out an idea called "Garden of Wonder" where each pavilion would have a small garden display in front of it. This would be for Future World and World Showcase and the displays would likely feature topiaries of characters "relevant" to the pavilion. The examples he used were Anna and Elsa in Norway or Eve and Wall-E in front of Mission: SPACE.
If true, it's more characters in EPCOT, but I do like the idea of a unifying theme. In that respect there's a similarity to the different types of boats in each land at Tokyo Disney Sea.