Note: This is not what I realistically expect to happen, because Nintendo are a bunch of dumbasses when it comes to casting their games, but if I was in charge of ****, this is the wonderful, perfect cast I would deliver:
Mario
Donkey Kong
Link
Samus/Zero Suit Samus
Pikachu
Kirby
Fox
Yoshi
Luigi
Jigglypuff
Ness (New Final Smash)
C. Falcon
Peach
Zelda/Sheik
Ice Climbers
Bowser
Falco (entirely new moveset, new Final Smash)
Ganondorf (entirely new moveset)
Marth
Mr. Game & Watch
Mewtwo
Pit
C. Olimar
Wario
Pokemon Trainer (Squirtle, Ivysaur, Charizard)
Lucas (slightly altered moveset to separate further from Ness)
Meta Knight
Diddy Kong/Dixie Kong (Leftover code from Brawl suggests Sakurai originally envisioned these two as a pair. They'd function as a double character a la Ice Climbers, but switch movesets a la Zelda/Sheik.)
Ike
King DeDeDe
Wolf (slightly altered moveset to further separate from Fox, new Final Smash)
Lucario
R.O.B.
Sonic
Snake
Tom Nook
Ridley
Toad
Bowser Jr.
Tingle
Griharim
Zoroark
Isaac
King K. Rool
Samurai Goroh
Lyn
Little Mac
Diskun
Mega Man
Cloud
Solid 50. Toon Link is the only Brawl newcomer that gets scrapped.
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Mer