We got more translations coming in with more Brawl info. WeeklyJumpman did a bunch of translating on some japanese forums and blogs and discovered more info. Here it is:
# It seems that if you "pass" a mini-game on the WarioWare stage, you heal slightly. <--Seems a bit odd to me, personally.
# Wario had his original overalls as a costume at Jump Festa.
# Meta Knight has a Kirby (pink) colored costume.
# Sothe, from Fire Emblem I believe, is an assist trophy. I guess he's supposed to use knives in the game, but doesn't in Brawl. Instead he does a somersault kick.
# NEW MUSIC! Animal Crossing Main Theme, Balloon Fight's Balloon Trip music, and WarioWare Main Theme. I have no idea what WarioWare's main theme is, unless they mean Ashley's theme?
# When you start a match, the background music is displyed.
# As seen on the Dojo, Wario-Man's bike is very fast and it's easy to SD with it.
# More info on Sandbag Item: You beat him up, and items come out as you hit him.
# The WarioWare stage features over 8 minigames, including "Don't Move".
# Level 9 computers are still weak, according to some people.
# Bowser and Kirby seem to be getting more and more praise for how much they have improved over their Melee forms.
# MORE MUSIC CONFIRMED: Yoshi's Island has songs called "Ending BGM" and "Athletic". Norfair has "Brinstar BGM", "Samus's Theme", and "Metroid Ending Theme". Bridge of Eldin has "Great Bay".
# Snake's Remote Mine (Down Smash) varies in damage from 10-20%.
# Kirby's new Dash Move is named "Break Spin". It's being refered to as the yo-yo attack, but does not involve a yo-yo of any kind
# We're having a bit of translation problems in understanding how Kirby's Final Smash works with items. We know they get sucked into the pot, but there seems to be something pertaining to the number of each item. Someone believes the translation suggests that it causes the sucked in items to turn into Kirby items, but I'm not aware of Superspicy Curry being a Kirby item.