This will probably will never happen, but I'd love for them to move the Frontierland Station to the Villains land, with a larger station and flat entry with no steps. I've always found the Frontierland station to be a pain (cramped space).
I'm originally from the west coast though, which has four stations, all rather easily accessible. Maybe they could splurge and do four in Florida? It'd be a great way to add a letter to the map without spending a whole lot more, since they're probably doing work there anyway. One can dream, I guess.