My guesses at the moment are pretty similar to others:
January: New Super Mario Bros DX
February:
March: Yoshi
April: Fire Emblem
May: Star Fox: Grand Prix
June: Luigi's Mansion 3
July: Town (GameFreak, eShop only)
August: Bayonetta 3, Daemon X Machina
September: Pokemon Generation 8 (XY released in October, and every other mainline game prior to it released in September in Japan; I can see them going back to it to space it out among the other huge hitters)
October: Animal Crossing
November: Metroid Prime 4
December: Zelda BOTW sequel (to be teased in Jan direct; going off of GameInformer's speculation that the next Zelda is closer than we think and assuming a Majora's Mask-esque sequel on the same engine)







