Sakurai, the creator and developer of the Super Smash Bros. series, has stated that he and his team are focusing more on quality, rather than quantity in the next Super Smash Bros. game. Meaning, more than likely, there won’t be any new characters added to the game. Unless, by chance, Sakurai will want to make DLC characters. But it seems impossible as he wants to refine the current roster.

“It isn’t a matter of ‘if the next game has 50 characters, that’ll be enough.’ There is a certain charm to games that have huge casts of playable characters, but they tend to have issues with game balance and it becomes very difficult to fine-tune each character and have them all feel distinctive.

“In terms of quantity, we’ve probably already reached the limit of what’s feasible. I think a change of direction may be what’s needed.”

Source.