How far is that?
Kirby hats: http://www.youtube.com/watch?v=Agtnr08Sj1g&feature=related
Taunts: http://www.youtube.com/watch?v=QlSxR3ebOzc&feature=related (Zero Suit Samus talks!)
Alt. Costumes: http://www.youtube.com/watch?v=JjMRXaRlvFY&feature=related
Also, Roy and Mewtwo were planned to be playable, they have victory music on the disc.
Shooting credits is much better, pictures of unlocked characters, Pokeball Pokemon, and ATs scroll, and the more you shoot, the more coins you get.
On Spear Pillar, Dialga can tilt the stage and send a damaging beam horizontally or vertically across the stage, while Palkia can do the beam or reverse the stage, so your location will flip. Apparently, Palkia can flip the stage, too.
Brawl might have downloadable characters!
Doc, Roy, Mewtwo, Plusle/Minun, Dixie and Toon Zelda/Sheik (Tetra) are in the coding for Brawl. They are roughly the same size file as Sheik.
They are not complete characters, they are just in the code, under characters. They still need moves, textures, sounds and Kirby hats.
The file for them to be complete would be small enough to be on the VC. They would need place holders if they wanted to allow these characters to be downloaded, just as Pokemon does (kind of). We have place holders. There is room on the character selection screen.
Now onto music coding.
Within the music, there are 3 unknown songs. 2 are "New Features" the other is oddly named "Purchase"
Purchase, as in buy. 2 unknown features and purchase. Sounds like something is buried in the game to be prepared for something...