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I expect the 2019 game/s to be compatible with the Pokeball Plus, in which case would make the controls very similar to LGPE (except buttons to fight and catch instead of motion gestures). As a result the menus and controls would likely be as similar as LGPE so they probably wouldn't be anything special, but that would also make me wonder how registered key items and maps would work, and they better not palp those. Either that or maybe overworld gestures could be used as a placebo for the lack of the Pokeball Plus buttons, but in THAT case, overworld gestures would indicate that many elements would be taken from LGPE that we might not enjoy. Going by all this, I wouldn't hold my breath for the 2019 games to be as jam-packed with content like BW/BW2 and instead expecting as little effort as LGPE unless the director of the 2019 games knows what they're doing.
All of this is just based off whether the Pokeball Plus will be usable in the 2019 games though so let's find out next year.