Here's my guess:
You have the PLAY, Journey of Water, and Cosmic Rewind featured. That's all new stuff.
SSE is there as an iconic anchor, but also because it was getting a thematic update.
AA is there... because of Regal Eagle?
And Horizons is there because 220, and someone forgot to tell the artist that the Horizons pavilion was razed.
And Figment and Imagination Pavilion are there because at one time they were going to announce an Imagination update. Imagination features prominently on the EPCOT model in the exposition pavilion. But, they cut it.
But the artwork was already done.
Yeah I viewed the piece as a past into future thing. The art on the left hand side is concept art from the early 1980’s and the right is the future. SSE being a constant in the middle. Idk, seems a bit interesting. Especially being designed by two imagineers. Could be nothing, I just find it notable.