This is gonna be a really long post, are you ready for it?
Ok, first off, since it was a crossover, Nintendo and SEGA have reportedly considered disqualifying Mario and Sonic at the 2014 Sochi Olympic Games as part of their three game deal, making there still one game left in this deal.
http://www.gonintendo.com/s/221904-...oom-is-the-second-of-sega-s-3-game-sonic-deal
Secondly, the next big Sonic thing, Sonic Boom, being promoted by a TV show and toy line is also represented by games, the first being first and foremost for Nintendo devices, as well as the Year of Sonic still being announced while the deal is still in effect.
http://wiiudaily.com/2014/02/sonic-boom-game-coming-exclusively-to-wii-u3ds-video/
And as everyone else may know who has played the Nintendo exclusive Sonic Lost World, the Yoshi's Island and Zelda DLC Is available on the EShop for free.
Lastly, Bayonetta 2 was announced as Nintendo exclusive during the February Nintendo Direct this year.