According to a recent tweet from Nintendo of Japan, gyro controls will be optional in Star Fox Zero.
The tweet states that you will be able to turn off the gyro controls in the game if you want to, much like Splatoon. However, if the gyro controls are as responsive in Star Fox Zero as they are in Splatoon, you may not want to; if gyro controls were a concern for you in the game, though, you can rest easy knowing that they will be optional.
— 任天堂株式会社 (@Nintendo) June 17, 2015
Gyro in Star Fox Zero can be turned off, if you want to for some reason. https://t.co/M21w1cfYbR
— StreetsAhead (@Sab_Mas) June 17, 2015