Super Smash Bros Switch: everything we know so far
https://www.techradar.com/news/super-smash-bros-switch-release-date-news-and-rumors
[Update: This is something that should be taken with a pinch of salt but a new rumor has emerged which suggests that a Super Smash Bros game will be coming to Switch later this year.
The rumor has emerged on ResetEra where an administrator and industry insider said that anonymous sources have said that a Super Smash Bros title for Switch will release at some point in 2018 and will be an enhanced version of the Wii U title, much like Mario Kart 8 was an enhanced Wii U title.