I just watched the video. Robin (that guy from the new Fire Emblem), Lucina (that other character from Fire Emblem) and Captain Falcon (revealed as a bonus) were just revealed to be in the next Smash Bros.
Looks like I was wrong. Lucina did get in. However is it just me or does her moveset seem identical to Marth's moveset? Also I saw Chrom being in the trailer but forgot what he did.