I have been raving over Wario in particular but the new Smash looks ace in general, I'm always a sucker for fanservice and extensive use of source material and the game excels in that regard.
Toad playing a bigger part in Peach's moveset, the return of PKMN Trainer, the Ice Climbers, Wolf and Snake, Leaf being a alt for Red, the designs for the Zelda characters, Ganon actually using his sword, Cappy and Mario's new alts, Dedede's new Final Smash, the addition of Ridley and the new Mother/Mega Man Final Smash cameos made me cheer just as much as the return of the shoulder charge did and that's only the biggest examples for me.