Two of the special moves you'll be executing with Wario have been revealed today in the daily update.
The first move is the special side move called the Wario Chopper. When executed he will jump on a motorbike and drive round the stage. You can jump off and then perform an attack on someone. Only one bike will appear at any one time on screen, so you can jump on it when required.
His other move is even more interesting and albiet smelly. The down special move is called the Wario Waft. The waft is what it says on the tin, Wario will push his backside out and fart. Nice.
The longer you don't use this move, the more wind that will build up inside Wario until he explodes. Explodes farting that is. More updates next week but keep yourselves amused over the weekend with the forum.