That is the most unexpected direction I can imagine for the Dragon Quest series.
I love it!
I guess the Joker series really isn't DQ x Pokémon, it's DQ x Digimon! LOL What a great trailer!
DQM:J2 was kind of a downgrade from J1. Less touch-screen usage, less compelling maps, quests, characters, & surprises, all it really had going for it was the giants, and that it ran more smoothly than Dragon Quest IX.
So far, I don't trust Square Enix to deliver with DQM:J3, on what they're showing us in this pre-rendered trailer. Vertical exploration, Free-travel underwater and flight, that would be the kind of RPG you'd need Monolith Soft to be developing for you.