Let's see, we had 35 characters in Brawl...and they had over 4 years to mull things over for the next Smash Bros (As usual Sakurai spouts nonsense, anybody remember when he vowed not to touch another Smash Bros game? Yeah that didn't work out).
I would assume this next installment would have at least 48 characters or else it will be pretty bland. I mean what can they add? We know we will get an adventure mode, cross platforming, etc...but without new characters and stages it's just masturbation (seinfeld ref haha)
I don't want to be THAT guy but I'd still really love to see Geno in Smash Bros. Even as an assist trophy, or even Mallow - I wish that SMRPG would get some representation; it didn't get any music, stages, stickers, or trophies in Brawl which I find pretty ridiculous considering it's popularity and that it had a VC release.