Imagine, Samus is fighting Fox, Kirby and Rosalina (all space themed character if you didn't notice already), and suddenly Ridley's theme plays, and the space dragon drops down and starts wrecking everyone. After all hope is lost, a light shines, and Xenoblade's music starts playing. A beam of energy bursts from off screen and knocks Ridley back, and the camera pans to reveal... Wii Music Band.
WII MUSIC BAND ORCHESTRATES VICTORY!!
Screen transitions to Sakurai, "As you can see, Ridley will be a boss in the Pyrosphere arena, but just in time to combat him is none other than Wii Music Band." Cut to gameplay footage of the Wii Music Band showing off it's moves. "Wii Music Band is the first four character fighter, using songs from games, even from 3rd party developers. I'm sure all of you are wondering where is Shulk, but don't worry, Shulk is in the game." An image of a Shulk trophy is shown. "As shown with our Wonder Red trophy, the new Super Smash Brothers will include trophies of 3rd party characters who have history on Nintendo consoles."
"Oh, and one more surprise, the man behind the Gematsu leak." Then the Xenoblade developer walks on screen, and they both turn towards the camera and say in unison, "Ridley is too big." and start laughing maniacally.
Just throwing out the possibility of the Xenoblade guy just screwing with everyone and preparing the ultimate troll video.