Nintendo has confirmed the return of Sky-High Sundae! Earlier today, Nintendo released a photo of their newest sneak peek and confirmed that the course will be in the newest tour in Mario Kart Tour. The new tour is expected to begin on Tuesday, September 5th, at 11 p.m. PT. There also appears to be a gold Wiggler costume. We will update this post when we have more information!
EDIT: The newest tour is the Sundae Tour!