ShinyLatios
Nintendo 3DS Legend
Towns Folk
Not necessarily. Some characters are rather static in comparison and only have aesthetic changes. For example, I'm pretty sure Fox's moveset has remained the same basically (speaking of, hope he makes it to SSB4 given the fact he's been around since the start...). They'd also probably include Mario in there given he's a Nintendo mascotYes, in the announcement video, he looked completely different, I think most characters on the roster will be available if a demo were to be, because they are always improving/changing.