A portion of a Game Informer interview with Game Freak's Junichi Masuda...
GI: Will we hear any chip-tune music recalling the original game?
JM: You’re going to see much less of it. It will be a more classical style of sound. Obviously, the fidelity of the music is going to be a lot higher than you may have seen in previous games. It will be a rich expression of the music, and you’re also going to see music from Pokémon Go appear.
GI: And what are the benefits of putting a Pokémon in the Poké Ball Plus? Is it like the Poké Walker from HeartGold and SoulSilver?
JM: That’s something we hope to announce later, but we don’t have anything to say regarding that right now.
GI: Why are motion controls required?
JM: The primary reason is really just to provide a new experience. There are a lot of people out there, I think, that really do want to throw a Poké Ball and role-play that. And as well as a lot of people out there who maybe haven’t played the main series of Pokémon, but would find that really appealing. By making that the only way to do it, I just wanted people to try this new experience.
GI: Is Game Freak done with the 3DS?
JM: Right now, we’re only working on Switch games with Let’s Go Pikachu and Eevee, Pokémon Quest, and as well as the title we’re hoping to release in 2019. They’re all Switch games.
GI: That’s not to say no more 3DS ever, right?
JM: All I can say is we’re hard at work on Switch games right now.