Emily Rogers made a new blog post about the NX's software output

[Miyamotoo]

Soundwave said:

I don't even want like 20+ Nintendo games a year. That's too many to buy, 15-16 Nintendo NX titles per year is more than enough and you basically get that amount by unifying platforms and reducing software redundancies (ie: no need for multiple Mario & Sonic games).

A first year lineup of say

November 16 - Legend of Zelda NX, Diddy Kong Racing NX
December 16 - Splatoon NX
Jan 17 - Advance Wars NX
Feb 17 - Pokemon spin-off
Mar 17 - Super Smash Bros. NX
Apr 17 - Mario Maker 2.0, New IP
May 17 - Pikmin 4K
June 17 - Super Mario 3D NX
July 17 - F-Zero NX
August 17 - Animal Crossing NX
September - New IP
October - Luigi's Mansion 3
November - Mario Kart 9
December - Hyrule Warriors 2

That would be a hell of a first year, but that's still only 15-16 games. If you have any more, realistically third parties have basically no shot at selling and if this is a unified platform likely at least you're going to have the Yokai Watch, Monster Hunter, and Dragon Quest devs needing some space too. 

So just one exclusive game at launch!? I really doubt about that.