Okay, time to get a feel for reactions.
Sakurai, after announcing the fifth and final Fighter Pass character, announces that there's one more character left...a surprise. One that breaks previous notions of what sorts of characters are allowed, after making an unprecedented agreement. Sakurai states that for just this once, and this once only, a character who didn't originate in a video game will be joining Smash. He says that this was tough to accomplish, but given that this character performed really well on the Ballot, Sakurai was determined to make it work.
The trailer plays. A misty mountaintop is seen, above a jungle. The camera zooms in on the jungle, to Wario being chased by...something. A shadow looms over Wario as he's trapped beside a mountain. Out from the bushes jumps a snarling...squirrel. Wario, unamused, shakes his head...only for another, larger shadow to loom over. Out from the bushes emerges...
"Ah! Wario. You're the last one I needed for Smash Bros. Bingo."