Bandai Namco announced that Sword Art Online Hollow Realization and Sword Art Online Fatal Bullet are coming to the Nintendo Switch in Summer 2019. In the case of Fatal Bullet, it will be the Complete Edition of the game which will feature the Dissonance of the Nexus expansion pack.
Sword Art Online Fatal Bullet Complete Edition is slated to launch in the U.S. on January 18 for PlayStation 4, Xbox One, and PC via Steam and in Summer 2019 for Nintendo Switch. Fatal Bullet will launch on Nintendo Switch after Hollow Realization launches but it hasn’t been stated exactly when that will be.
Bandai has begun streaming a trailer for Fatal Bullet Complete Edition which can be seen below. Hollow Realization has not yet had an announcement trailer for the Switch version.
For a review of Fatal Bullet, check out the following link: https://www.theouterhaven.net/2018/02/sword-art-online-fatal-bullet-review/