Posting this here while Smashboards' servers recover:
brawlcentral.com/forums/viewtopic.php?f=45&t=489copy pasted:
Veteran Fighters
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-Mario
-Luigi - Jumps higher than Mario and uses a different fighting style.
-Link
-Kirby
-Pikachu
-Fox
-Samus
-Zelda - Can transform into Sheik. Though this Sheik isn't the one we loved playing as in Melee, this Sheik is an updated TP inspired model.
-Bowser
-Donkey Kong
-Yoshi
-Peach
-Ice Climbers
-Marth
-Captain Falcon
-Mr Game & Watch
-Gannondorf - TP model
-Ness - Has a completely different style of play than his SSB and Melee counterpart.
-Mewtwo - Fighting style changed slightly (for the better)
-Jigglypuff - Fighting style changed slightly (for the better)
-Falco - Has a completely new moveset. He may not be as fast as Fox himself, but deals a bit more damage.
New Commers
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-Pit
-Wario
-Zero Suit Samus - Only playable after using Samus' FS
-Ike -
-Pokemon Trainer
-Takamaru - From Nazo no Murasame-jō (JP only released game).
-Diddy Kong
-Vaati - A new, updated character model.
-Meta Knight
-Snake
-Young Link - Has a different moveset than Link, is a bit faster and in SSBB he will have an upgraded character model which isTP inspired.
-Lucas
-Lucario - A highly demanded character. Sakurai was skeptical about including him due to too many pokemon characters in the game, but went along with it at last minute.
-Sonic
-King Dedede
-Wolf O'Donnell - From the Star Fox series
-Pikmin & Olimar
-Black Shadow - From the F-Zero series.
-Animal Crosser - Alt costume consists of 2 male models and 2 female models. (FS is pretty hilarious, but I wont spoil it)
-Mii - Able to use a character from Mii channel. Same FS and moves for all Miis obviously.
-Andy - From the Advance Wars series.
-Ray 01 - From the Custom Robo series
-Bowser Jr - Imagine a faster bowser, though weaker (not to be confused with Baby Bowser, who wont be in this game).
-Geno - Was put in to feed the fans basically, Sakurai wasn't going to add him, but wants this game to appeal to fans and last a long time (at least till the next SSB).
-Sukapon - From Joy Mech Fight (nintendo game from the early 90's)
-Krystal - From the Star Fox series
-Dark Samus
EDIT: This too...
Darkrai is likely not playable. That's a weird character addition if you ask me, and Serebii at some point said he was sure that Arceus and Darkrai were not present (according to his sources). Then again, Shaymin IS present, so that may have changed from Serebii's knowledge--though likely NOT the playable character.
If it isn't Lucario or Mewtwo, I still venture Jigglypuff. It's too much to go and search for all the rosters Serebii has "deconfirmed," but almost ALL of the "leaked" rosters included JPuff and we just assumed Mewtwo got the axe because of ChaosZero. We NEVER confirmed that he was 100% legit, and we know for a FACT that JPuff was originally planned to be cut from Melee.
If we get a new character in the realm of say... Pac-Man or something like that, it's not that far to say they adopted JPuff's moves. Afterall, it happened with Ness to Lucas. Jigglypuff can be recycled. But she is not necessarily guaranteed to return. Beating up on the Puffster is a Smash staple, but not a requirement. Hayter was just reciting what he knew if this is the case. We can not take an amateur interview as a legitimate source, no less the mumblings of a voice actor who obviously was only casually familiar with Smash Bros.
That said, there's one other option: Pichu.
Was it ever GUARANTEED he got the axe?