Just finished watch the Japanese Direct for it. And yeah it looks kinda like a cross bwtween turn based RPG and Tomodachi Life, by having your party members, villian and NPC be Mii's who have had their faces stolen and placed on various monsters.
At 13:53, the following Nintendo costumes appear. Yoshi, Mario, (orange) Inkling Girl and K.K. Slider.
There's also a Triforce that appears in a speech bubble at 6:30. I thought it might not be a in game speech bubble and added in post, but the outline edge does resemble other in game speech bubbles.