RUMOR: More info on Nintendo x SEGA - 3rd Sonic game is a racing game staring Nintendo crew, Deal may extend to other non Sonic SEGA games and expect Sonic and Bayonetta in Smash.

[Metrium]

I doubt MK8 will launch in 2014. The fact that it will be playable at E3 makes me think it will launch by the end of the year. Nintendo usualy likes to reveal games when they are months away of realease, with a few exception.