Also, another article on the website confirmed Avatars as well.
Also, Nintendo Power mentions two of the all-stars. All of the All-Star moves are in "flight" form, they mentioned Sonic and Beat.
Sonic, his car transforms into what looks like a "spin dash" attack.
Beat, his car obtains huge speakers that send racers all over the place. --- I'm considered a playa in Fire Emblem, because I've been screwed by the RNG Goddess plenty of times.... 3DS FC:0130 1804 1761