I found another rumor, i'm going to attempt to link(heh puns) to the Gematsu Leak.
Some of this does help the validity of the leak so it isn't off-topic.
The rumor says:
Hello, I am here to give you info. Whether or not you choose to believe it is up to you, I am not going to try and convince you nor can I prove this info at the moment. Also, the position I am in does not allow me to give extreme details such as the full roster or anything along those lines. I will only be giving hints to things included within the game (Ex. no “*insert character name* is a playable character”) This is simply some info I have heard that I hope will help better put you all in the right direction.
- There is an interesting new game mode which has not been revealed
- An unexpected character returns
- The character roster is quite different from those predicted or “leaked”
- It releases much sooner than expected
- There is a character hinted at in almost every trailer, even in the E3 trailer and I mean a different character for each trailer
- There are indeed secret characters that won’t be revealed until the game releases (there are also a couple characters I have seen few predict or “leak”)
I'm not really sure where the OP got this but oh well.
http://ssb4dojo.com/post/84756727466/sunday-rumor-mill-vague-leak
I noticed that it said
"There is a character hinted at in almost every trailer"
So I went through the trailers
Megaman - During the starting point where we see Megaman, on the ground you can see pieces of grass some resemble those of the mechon ruble in Xenoblade(I've only played some so i'm not sure) That could be possibly hinting at Shulk, but we see the wrestling ring stage, which I believe could have been hinting at Little Mac
Villager - We can see Samus using her final smash, this could possibly hint at ZSS although that's not a new character, at the end of the trailer you can see Villager drop a bowling ball which could hint at Mii
Wii-Fit Trainer - At the beginning you can see Link, Kirby, and Mario posing, in sync that may hint at Rhythm Heaven Choir boys. Although when we see WFT's splash screen you can see the wii balance board hop around in the same fashion that Luma does and that is part of Rosalina's character.
Little Mac - Doc counts to 101 at the beginning of the Little Mac trailer. Wonder Red possibly?
Also another interesting note is we see the final destination version of Wiley's Castle(?The Megaman stage) It's also possible but doubtful that when Samus was comparing height with Little Mac it could have been a nod to Ridley, but again doubtful
Rosalina - While I can't find anything "solid" you can see a green light in the background that closely resembles a Pokeball
Greninja - Other than the obvious Mewtwo Troll, after Greninja launches him self into the air you can see a cloud that looks like Pacman(AndTheTreeBranchKindOfLooksLikeRidley.RidleyConfirmed)