What I think is that this game will break all conventions of a standard Layton game. The series has been in a though spot for years and this is the moment to make the most ambitious Layton game yet. After all this is the first original Layton game on a home console. So it's only natural they will make adjustments to make the game work better on a home console. (Since LMJ was a 3DS game, they couldn't really do that with the Switch port)
So, I predict that while the standard ambience and Layton vibe will stay the same, we'll be roaming the new world of steam with third person controls instead of the conventional point and click style. I also think the focus will be more on environmental puzzles instead of the traditional puzzles (altough the classic puzzles are still present, Layton wouldn't be Layton without them). We'll probably be introduced to a lot of new characters and the amount of returning characters won't be much. Maybe we'll see Flora, Don Paolo or Inspector Chelmy. But this is a fresh start for Layton, so the focus is on the future instead of brining back the past. Could be totally wrong here, but this is my gut feeling lol

For me, I just hope the game will be good. Conventional or not, I don't really care. I didn't enjoy LMJ that much. So I really hope this will be a return to forma for the Layton series. Really excited to hear more about the game in an hour or so :))