shoichi on 14 June 2017
My guess is they will just go back to how every GB/GBA/Wii/N64 game had the UI look for in-battles with maybe some improvements. Lower right corner of the screen shows your options, and either above the pokemon or a lower left bar/top right bar for opponent shows the hp, etc. I'm maybe be the change graphically as was from the old DS to 3DS.
I highly doubt it will be action rpg ala KH3, newer FF games, etc. As it would change up the meta way too much. They would probably release a side-game that features that and see how the reception is first before thinking of changing the core formula.
