There are two paid DLC packs coming to Mario Kart 8, as you may recall. They'll each feature new tracks, new characters, and new vehicles. For the first one out in November, one of the new vehicles is the classic B Dasher.
You ought to recognize B Dasher as Mario's signature ride on the cover of Mario Kart DS. The kart made a return in Mario Kart 7, and now it'll be available to Wii U racers. It'll accompany F-Zero's Blue Falcon as two of the four new karts coming in the first add-on.
The first Mario Kart 8 pack arrives in November, while the second arrives May 2015. Each will cost $7.99, but you can pre-purchase them as a bundle for $11.99.