Not 6 , No I Would Just Take 3 Out Of The 6 (Snorlax , Espeon , Charizard )
Pikachu is already a character so it would not happen anyways

I speculate Mr. Game and Watch since he must be the easiest veteran to sprite.

Now that I think about it more the Gangplank Galleon stage is starting to concern me now that K. Rool might just have a chance at being playable.

And quite possibly with the Majora's Mask remake coming up soon, perhaps they are going to reveal Skull Kid in APEX 2015. They did it with Chibi Robo when Chibi Robo: Photo Finder released, I find the situation pretty likely to happen.

-I Like The Possibility Of King K. Rool , He Will Seem Interesting To Play As. Same For The Fact Skull Kid Could Be Playable , Id Love To See His Moveset Potential

-But Id Rather See Young Link From Majora's Mask Back But His Moveset Would Be Around The Mask ( Deku , Goron , Zora ) And Final Smash Of Fierce Deity Mask x3

I also hope for K. Rool and Skull Kid.
And for Lip, from Panel de Pon

Not to mention how unique(somewhat) the character is.

DOES ANYONE KNOW WHEN THEY ARE ADDING MORE CHARACTERS
These are characters we need in the next game
-pit
-ike
-bowser
-luigi
-lucario
-snake
-game n' watch

They haven't announced Smash Flash 3 yet

Almost Every New Version Demo ( I Think You Were Trying To Say Demo BTW )

And I Can Make A Wise Guess That Almost All Of Those Characters Might Make It , Not So Sure About Lucario And Ike. But Everyone Else Has A Very Likely Chance

I speculate Fossil Fighter(Hunter) or T-Rex from Fossil Fighter as a playable character(s). Fossil Fighter can play as a combination of PKMN Trainer; Olimar; and Villager, while T-Rex would play similar to Bowser and Pikachu. Plus using either of these characters gives the Devs a chance to be creative with there movesets.

Falco, Luigi, Ganondorf, and G&W.

I speculate Luigi, Luffy, Bowser, Ganondorf, Shadow, King Dedede, Crash Bandicoot, Pit, Mewtwo, Lucario, Snake, & Simon Belmont.

EDIT: I could also see Rayman and maybe Viewtiful Joe joining the roster as surprise characters.

I mean, the reason I say Viewtiful Joe is because he seemed to be deleted from the Assist Trophies roster to make room for some new Assist Trophies due to the major roster change a couple of years ago. I mean, I could be wrong, but who knows what Cleod and his amazing team can do with this roster.

Vegeta was confirmed to be cut from the roster, and Sasuke is probably cut as well. However, I am still hoping for Shadow to join!! I also agree that Simon Belmont could be joining the roster as a Surprise Character.

Try not to Double Post again. Just use the Edit button next to the Quote option.
I don't really think Shadow should be in, I think either Knuckles or Eggman could be better choices for a last Sonic characters.

Thanks for the heads up my friend. By the way, I honestly do not see Eggman getting in. Although, he would be a great character to play as though.