We likely will not be getting a newcomer until April. So game anniversaries won't really matter for right now unless it's for a veteran.
Get ready for random reveals.
I know my predictions are probably going to end up wrong... but regardless, here they are:
March 14 (Friday) - Yoshi (Yoshi's New Island)
March 28 (Friday) - Wario (1st anniversary of Game & Wario)
April 14 (Monday) - Takamaru (28th anniversary of Nazo no Murasamejou) @ Nintendo Direct
April 28 (Monday) - Mr. Game & Watch (34th anniversary of the 1st Game & Watch game)
May 14 (Wednesday) - Ganondorf (13th anniversary of The Legend of Zelda: Oracle of Seasons/Ages)
May 27 (Tuesday) - Zero Suit Samus (10th anniversary of Metroid: Zero Mission)
E3 2014 on June 2014 - we might get 3 more newcomers here... maybe Mii, Pac-Man, and Palutena (to mirror Villager, Mega Man, and Wii Fit Trainer at E3 2013 respectively)