How bout starting with the 2 parks that have tiering, and no *publicly announced* plans for additions.
I'm aware of the rumors for DHS, but they are still just rumors. I was watching a disunplugged podcast from march 2013 and they were talking about these rumors (carsland/star wars.land/renaming the park) then..and yet still no announcements. I'm also aware of the Frozen ride in Epcot - that took the place of another ride, so it isn't an *addition*. The meet and greet is one addition, yes, but meet and greets have much lower capacity than rides do, so one m&g addition won't do much to address epcot's lack of attractions issue.