Smash Bros. DOJO!! has detailed two of Wario's bizarre special moves, both of which were featured in the original E3 2006 trailer.  The first is called Wario Chopper.  Triggered by a special side attack, Wario will drive his motorcycle back and forth along the stage.  He can even get off, and other characters can pick up the vehicle.  His second special move is the infamous fart attack.  Named the Wario Waft, the down special attack can be charged.  The longer he holds in his gas, the more powerful the blast upon release.  Check out the explosive screenshots on the website.

Link: Smash Bros. DOJO!!