A while ago, Nintendo opened up a fan vote to determine who the next Smash Bros. DLC characters would be. Then, Lucas, Roy, and Ryu came out. You probably already figured this out, but those characters had absolutely nothing to do with the DLC vote. Rather, they had some of their files already ready to go before the DLC vote even started. Sakurai recently confirmed this in an interview with Famitsu.
So what of the other characters? Well, Sakurai says they are on the way. We can expect to see several more characters added to the roster. According to Sakurai, new characters will be added to the roster until the team that is working on the game can no longer be kept together.