http://boards.4chan.org/v/thread/421426667/smash-leaks
Settling the score here, some of you have already figured it out, but here's the scoop.
Waluigi is in. His moveset isn't entirely sports based. His theme is 'Wacky' but not like a joke character.
I'm not revealing much in the interest of still keeping things as a surprise.
Here's some background information. Waluigi wasn't seen during any of the gameplay at E3, this is intentional. This all leads into the next direct.
Remember when he got KO'd in the assist trophy trailer?
>Direct pulls a 'one more thing' and goes on about a new fighter in smash.
>Cut to scene 1, object is flying through the sky, ala team rocket.
>Second cut is a zoomed in shot on Delfino Plaza, with an increasingly louder "Waaa" in the distance
>loud thud, and glass breaking can be heard. Waluigi's hat falls on screen. Camera then slowly zooms out and reveals a broken assist trophy
>Waluigi's feet seen kicking and stomping the assist trophy.
>picks up hat
>zooms out to putting hat on
>WALUIGI REVEAL
Source: I am the dad who works at Nintendo.