I'm not happy with this as a March release, but I'm inclined to think it will be. If it was January, then it would have been at the recent Nintendo Direct.
Something went catastrophically wrong with Mario Golf and Yoshi's New Island. Imma guess some tea tables are getting flipped, since both games were 2013 games that seemed like for Q1 and now they're looking unlikely for Q1. Though, even with Kirby in March, I could see one of those two showing up around the same time.