Mario & Luigi: Dream Team

[Chaoxys]

Gonna miss the sprites, but at least the game looks stylish and reminiscent of the sprited style.

Spoiler

I'm gonna miss Fawful, though

I honestly wasn't sure if the characters were detailed sprites or models honestly (also, the in dream sections seem to be sprites still).

As for the other thing you said, take a look at the first image. Theres some familiar NPCs from the first game there, so it may hint to something.