We're doing reveal trailers huh?
Trailer starts off with various fighters (don't know which ones) duking it out in a forest setting. As the battle goes on the screen cuts the smash ultimate logo, while the audio of said battle is still going.
The fighting stops as the fighters notice the faint sound of a banjo playing. Specifically the tune that plays in the opening of tooie. All while the camera slowly zooms in on a large rock within the forest.
https://youtu.be/HOxvtdPw_DY
0:00-0:15
As it plays, we cut back to the white screen with an X in the middle (indicating crossover)
Cut to a close up of the banjo being played by a pair of paws. One of the banjo's string breaks before the final note, as it's player sighs out a "doh".
Cut back the the white screen showing the old Rare logo.
Cutting back the the rock, the player gets up to stretch, as a bird like figure from a back pack emerges to do the same. The 2 are obscured by the shadows from the trees, but their outline is visible.
With one big flap or it's wings, the duo flies up and slowly descends in front of the fighters. The camera zooms in on the ground where they land and slowly rises up to reveal banjo kazooie. Banjo give a thumbs up and utters his iconic "guh-huh". The two strike and pose as their main theme plays:
https://youtu.be/dQNAVqW1shA
"BANJO KAZOOIE GET JIGGY WITH IT"