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I like the idea of optional side-dungeons that have something like a Totem battle at the end, allowing you to get Z-Crystals, Mega Stones, or some kind of item. Nothing open-world, but something else to do. Maybe some could have Legendary or Mythical at the end. Especially in the case of Mythicals because that "Okay here you go" approach to them they've been doing is disappointing as hell. But knowing Gamefreak they'd just be glorified hallways.
Aside from that, the usual extended postgame and battle frontier, bring back old features, less handholding/cutscenes, difficulty options, easier breeding, etc stuff everyone's been saying.
