https://www.gamespot.com/articles/super-smash-bros-switch-reveal-makes-fans-go-absol/1100-6457296/

For a 30-minute presentation, March 2018's Nintendo Direct was jam-packed with presentations. Nintendo reeled off announcement after announcement, with the bulk of that time spent either highlighting details about previously announced Switch games or revealing new ones. Nintendo then teased that the show was over, only to sneak in one last announcement--Super Smash Bros. for Nintendo Switch.