Waluigi will be appearing in Super Smash Bros. Brawl as an assist trophy, clad in his traditional outfit and carrying a tennis racket.  The Smash Bros. Dojo site's 12/14/07 update revealed Waluigi (as well as Stafy, that loveable starfish from under the sea) in all his purple glory.

At this point, I'm starting to wonder how many Nintendo franchises won't be in Brawl.

Here's a preliminary list, culled from The Nintendo Database.  I trimmed out any games that already seem to have character/music/item/whatever references in Brawl... how many do you think we'll eliminate by the time the game launches?

Stuff in bold represent games that had trophies/music/items in Melee.

(I'm making no guarantees this list is currently complete, nor up to date; however, it generally seems to be accurate.)

1080° Snowboarding
Alleyway
Arm Wrestling (arcade)
Band Brothers
Battleclash
Card Hero
Chibi Robo
Custom Robo
Doshin the Giant
Duck Hunt
Electroplankton
Eternal Darkness (the ip belongs to Nintendo, I believe)
F-1 Race
Game & Watch
Golden Sun
Gumshoe
Hajimari no Mori
Happy Panechu!
HeliFire
Hogan's Alley
Hotel Dusk
Joy Mecha Fight
Kaeru no Tameni Kanha Naru (the guy that turns into a frog -- cameo in Link's Awakening)
Kururin
Mach Rider
Magical Vacation
Marvellous
Mole Mania
Nazo no Murasamejou
Oendon/Elite Beat Agents
Picross
Polarium
Radar Mission
RadarScope
Sennen Kazoku
Shin Oni Ga Shima
Short Order & Eggsplode
Sky Skipper
Solar Striker
Space Fever
Space Firebird / Space Demon
Space Launcher
Star Tropics
Stunt Race FX
Sutte Hakkun
Tantei Club
Teleroboxer
Time Twist
To The Earth
Tomato Adventure
Trace Memory
Urban Champion
Wave Race
Wii Sports / Play
Wild Gunman
Yakuman (Mahjong)
Yuu Yuu Ki

All the generic sports titles