Now I am wondering what unannounced 3rd party titles does Gamestop know that we don't. Anyway here is what I predict in the coming months.
August: Yoshi
September: Super Smash Bros
October: Mario Party(ND Cube has a game yearly. This fits their quota)
November: A Big Nintendo game (Pokemon/2D Mario/Animal Crossing)
December: Fire Emblem. (The Xenoblade 2 of this year. )
This is a really good lineup. Might make up for the weak 1st 2018 half. What Gamestop is saying isn't too far fetched.