Trailer opens, you see Mario driving a Kart, speeding down a straightaway, smash invitation in hand. Mario Circuit is playing over the trailer.
Mario looks focused, but you can see a shadowed racer in the distance trying to catch up. Next thing you know they're right next to Mario stealing the invitation and speeding away. Mario immediately recognizes who it is. It's his old rival, Sonic the Hedgehog! (Super Sonic Racing hits just as Sonic steals the envelope)
Mario furrows his brow and steps on the gas. They go back and forth a couple of times taking the envelope, the music changing to each other's tune every time they grab the envelope.
All of a sudden, you see yet another shadowed racer in the distance. A missle fires off. It hits Mario but the racers are so close they both end up wiping out.
The third racer hard brakes as he catches up to the 2 dizzied mascots and grabs the invitation that's been knocked to the floor
Warp room theme hits and we see that gameplay. Yes the megaphone is a taunt.
The invitation was for Crash. Mario and Sonic wanted to steal it and give it to Waluigi and Shadow, respectively cause they're shook