Dark trailer with Samus going thou some huge space ship. Suddenly a sound and some small pieces of rubble fall from the roof. The wall next to Samus start shaking. The wall gets shattered and Ridley burst throu attacking her. The heroin dodges backwards, raises her canon towards the beast and starts charging a shot. The camera zooms in against the "pipe" of Samus canon, she fires and the screen goes completly bright. The text "Metroid U" pops up. Then it fades to black and you think its over, but someone yells "CUT!!!" loudly. We see the two fighters again but suddenly the stage behind Ridley and Samus has turned light green and the room gets filled with bright light. The camera zooms out and we see the back of a director sitting in a chair, multiple cameras, lamps and that the scene is a studio with a green screen. Not a battle ship.
Some nervous assistant runs up to Samus "Ms Aran, I'm sorry but we have to hurry. Your next scene is about to start soon". Samus puts her helmet back on, waves at Ridley to join her and they walk out of the studio, into a corridor and walk up to another door. It has the smash logo on it. Samus walk throu not noticing Ridley cant follow, the door is to small. An animated Sakurai comes running, looks at Ridley and says, "too big, you cant get in here!". Ridley gets furious and responds with breaking straight throu the door, ripping some of the surounding wall down with it. Then he walks up to the camera set where Samus is already posing with an aggresive fighting stance. On the opposit side of the screen Mario and Luigi is warming up. Ridley walks up behind Samus, lets out a battlecry wich makes the brothers on the other side jump up and get ready. Samus and Ridley both rush towards the plumers. During all this we can see the text over the green screen saying "Smash takes #48, Battle of the franchises, Mario v Metroid". As soon as they clash in the middle and the camera zooms in, the green screen turns to some of the new Smash stages and the smash trailer continues from there. Focusing on different franchises put vs other franchises (also getting a joke in there where someone like Wario that is alone gets put vs the whole Zelda team. (consisting of ganon, zelda, link, toon link and toon zelda)).
So there you have it. Metroid and Smash will share a trailer. A trailer that announces Retros new Metroid U and then confirms Ridley for smash and whatever else is in the trailer. After that Reggie lets some hot shot form Retro take the stage and talk a bit about the game. He will finish his presentation with saying how excited he is to play Ridley in the next Smash Brothers and will hand the mike over to Masahiro Sakurai. Smash presentation follows, release date announced, demo will be on the floor, thank you all for watching, bye. Thats pretty much how it's gonna go down, you heard it here first.