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More open world. No more random battles, all pokemon are visible in the overworld.
Lots of little nooks and crannies to explore.
A world that feels alive, with an actual ecosystem: I want to dive to the bottom of the ocean to catch kabuto on the seafloor, or scale a high mountain to catch a rare bird pokemon. In terms of story, try to maintain a similar level of characterization to SM but with less intrusiveness.
Overhaul breeding/training mechanics to make raising competitive pokemon a less tedious affair. Get rid of trials, bring back gyms. Totem pokemon are ok and can still exist as a separate thing, but the trials themselves are garbage.
And of course, a fully equipped post game battle facility.
That's mostly quite ambitious and I don't expect any of it. To be honest, I just don't believe GF has the competence or the interest to deliver the true AAA console RPG experience we've all been craving for years.