with some sort of enhancement within the reveal trailer, so it’s safe to assume that the family of King Koopa is set to make another appearance - but then again, it wouldn’t quite be Mario without them.
That said since it follows a traditional 2D Mario game appearance, we can generally expect a similar storyline to follow in protecting the Mushroom Kingdom from any evil forces that may be attempting to destroy the peace. Wonder is still a bit of a mystery, and it isn’t covered in great detail within the single trailer we have received for the game.