While the game was rumoured to be a wholly new title in the franchise, the title is actually an amalgamation of all the content from Super Smash Bros. for Nintendo 3DS and Wii U. Previous characters from the series that have been recently omitted, such as Snake from the Metal Gear universe, is also making a return. This is indeed a complete roster.
Despite being essentially an extended, re-tooled version of an existing game, it will include some all-new characters such as Inklings from Splatoon and as well as a variety of new stages, tweaked character abilities, and other enhancements.
Not all characters and stages will be available from the beginning of the game, however. Characters will be unlocked in a unique and engaging way, to make progression fun and interesting for players, rather than having everything unlocked from minute one.
Character final smashes have also been updated to take into account new games and styles such as those from The Legend of Zelda: Breath of the Wild and Star Fox Zero.
Super Smash Bros. Ultimate launches on Nintendo Switch this fall.