Mine: One more stage (maybe Sonic's?), one more surprise character (Miis), final smash for zelda, final smash for Miis, 3 generic "this is how you play" updates, snake final smash, 2 more assist trophies, 1 item, Pikachu special moves, special costumes for one of the characters, and... um... one more...hmmm how about a "It's available, go and get it and find out yourself...unless you live outside of Japan then I guess you'll just have to wait" update. And songs intermixed in some of those updates, likely the stage.
You know what, I think I'm expecting too much. This game has so much in it, that now I'm expecting more.