Technically they only said "2017", I think the NOA person who wrote up the profile may have just put March there out of haste.
I wouldn't be surprised if the NX version comes out first too ... they did the same with Twilight Princess and it worked out well for them, they'll probably do it again:
https://en.wikipedia.org/wiki/The_Legend_of_Zelda:_Twilight_Princess
At E3 2006, Nintendo announced that both versions would be available at the Wii launch,[41] and had a playable version of Twilight Princess for the Wii.[o] Later, the GameCube release was pushed back to a month after the launch of the Wii.[42]
You never know with them. Yup, they lied or "changed their mind" about a simultenously launch for TP on GameCube, GameCube version was supposed to launch day and date with the Wii launch:
https://youtu.be/nsg3ZWaw3ns?t=25m49s
