The first 13

The premier should have more characters than the original game had, but not too many. I think Mario, Link, Kirby, and Pikachu all need to be in the first 4 showed. Similar to Brawl, they start fighting

Samus should quickly appear of course with her bombs and lasers.

Fox would also appear using his blaster.

Ridley would come from the sky. He starts to attack everyone except Samus.

Starfy comes to the aid of Kirby and shows a fighting stance against Ridley. Ridley taunts and Starfy unleashes a final smash on him.

Geno should start by coming to Mario's aid. Showing off a few of his moves as well.

Little Mac should appear next to Link's help. He'd show a variety of punches on Pikachu.

Lastly, Mewtwo should appear to aid Pikachu. He'd enter by shooting down Little Mac with his shadow balls.

Megaman should be last for the surprise of course. This would really top off the trailer.

Little Mac

First Appearance
Punch-Out!!
1984
Arcade

Little Mac, the main character from the Punch-Out series (which just got a revival after nearly two decades later) is an obvious choice for the next Smash Bros. game. Everyone who lived in the 1980s knew the game, and Little Mac was pretty much a household name at the time.

Possible Moves
Little Mac could be similar to Captain Falcon in a sense. He would be a very fast and powerful character, but would have no projectiles. Also, he would be a fairly light character.

Imagine this as Little Mac's Entrance

He'd have an uppercut maybe as his final smash, which would basically be a 1-hit KO but only be for 1 opponent and would have to make contact.

Most of his other moves would be different types of punches, including his side punches and his tornado or spinning punches. Maybe a charged punch similar to Donkey Kong's punch too.

I'm pretty confident that we'll be seeing Little Mac as a playable character rather than an assist trophy.