Rainbow Road in the Rosalina and Luma Trailer.
Rainbow Road is a track in the Mario Kart series. Rosalina and Luma's trailer showed Mario, Luigi, Peach, Bowser, DK, and Kirby racing here.
A few days later, It was confirmed to be a stage on the 3DS version of the game, but it is still unknown if it will appear in the Wii U version as well or if there will a Wii U version for the upcoming Mario Kart 8.
Rosalina and Samus fighting in the 3DS version of Rainbow Road.
Shy Guys on Rainbow Road.