For those that care, Sakurai's Developer Direct is now available without the translator.
http://youtu.be/Sc5BISnOVPM
This is nice because it allows me to hear some of the music and sound effects for the stages. So far here's what I managed to pick out.
Super Smash Bros. Melee -
Menu 1 [arranged differently in the video]
The Legend of Zelda: Spirit Tracks -
Realm Overworld
The Legend of Zelda: Ocarina of Time 3D -
Gerudo Valley
Nintendogs + Cats - [sounds like an arrangement of the Title Theme. Not that familiar with series]
Super Mario 3D Land -
Main Theme
Animal Crossing -
Main Theme
Wii Fit -
Yoga
Megaman 2 -
Dr. Wily's Castle [there also sounds to be an arranged version]
The Legend of Zelda: Skyward Sword -
Ballad of the Goddess
Animal Crossing: City Folk -
City (Day)
There is also some music that plays when Mario and Bowser go at it in the ring stage, but it sounds like an original composition of some kind. There is more to be added to this list.