https://www.cnet.com/news/e3-2018-get-your-first-look-at-super-smash-bros-ultimate/

It wouldn't be called Super Smash Bros. Ultimate if it wasn't the culmination of the entire franchise, would it? At their E3 2018 event Tuesday, Nintendo pulled back the curtain on its flagship fighting game, and there's lot to go through. And if all of this information has you dying for a release date, don't worry. Nintendo revealed Super Smash Bros. Ultimate is scheduled for a December 7, 2018 debut.

You read that right. Every single character that's ever been in a Super Smash Bros. game will be in Ultimate. And that includes the third-party DLC characters from Super Smash Bros. for Wii U and 3DS like Ryu, Cloud and Bayonetta.