According to Dr. Serkan Toto (a twitter user) who has apparently heard from inside sources, Bandai-Namco is currently under way on multiple new titles planned for release on NX. One of these is allegedly some form of Super Smash Bros. It's unknown whether this is a completely new game, port, or spin-off, but it's a game in the series, and is planned for release at NX launch.
Honestly if this is true it makes sense to me. Bandai has supported Nintendo quite a bit in the past, so I don't doubt that they'd be working on more for NX. Even the Smash Bros. at launch seems believable to me, as I've been guessing that they'll make an enchanced port of the Wii U and 3DS versions for NX. If it were to be a completely new Smash then I'd say it's not true but honestly that seems likely to me. (whether this rumor is true or not)
Honestly if this is true it makes sense to me. Bandai has supported Nintendo quite a bit in the past, so I don't doubt that they'd be working on more for NX. Even the Smash Bros. at launch seems believable to me, as I've been guessing that they'll make an enchanced port of the Wii U and 3DS versions for NX. If it were to be a completely new Smash then I'd say it's not true but honestly that seems likely to me. (whether this rumor is true or not)