So far, Mewtwo, Lucas, Ryu, and Roy have been added to Super Smash Bros. for Wii U and 3DS. Masahiro Sakurai recently had an interview with Famitsu in which he speaks about future DLC plans.
According to Sakurai, he want to make as many DLC characters for fans as possible for as long as he can keep the development team together. He predicts that there will be “several” more characters made before the Smash Bros. team moves on. This will include fan-requested characters via the Smash Bros. Fighter Ballot, as well.
Sakurai asks for patience from fans as they develop more DLC content.by