This morning Nintendo revealed a brand new stage for Super Smash Bros. 3DS in the form of Mario Kart 7's Rainbow Road.
Initially teased in last week's Nintendo Direct Smash Bros. Trailer, the stage is now officially confirmed via a 3DS screenshot.
In today's Miiverse post, game director Masahiro Sakurai stated: "Here's a new 3DS stage--Rainbow Road! It can't be explained in one picture, but it's going to be a cruise-type stage."
Presumably the cruise-type stage description references the fact that players will battle on a stage that cruises around the Rainbow Road.
The screenshot itself reveals more about Rosalina and Luma, as Luma uses a Star Cannon to blast Rosalina away from an incoming Samus missile attack.
This particular Rainbow Road is for the 3DS version, presumably based on Mario Kart 7 but it seems extremely likely that the Wii U version will also gets its own Rainbow Road, taken from Mario Kart Wii or Mario Kart 8.