This may not be perfect, but I'll try to explain as well as I can for all of the characters on here that haven't been revealed yet
Veterans:
Wario, it doesn't seem right to leave him out of smash bros and he was decently popular in brawl
Ganondorf, I think Ganondorf will stay in, but he will keep the same, or at least a similar moveset, so sadly, he is still a falcon clone
Jiggs, it's one of the original 12 so it deserves a spot, and let's hope it is as good as it was in melee cause it's awful in brawl!
Meta: Of course they'll leave him in, just try to tone him down a bit this time Hal
Ness, once again, he was in the original game, so it makes sense to leave him in
Lucas, Lucas seems sort of in Limbo right now, if you asked me before the Ike reveal, I would have definitely said no way, he's getting cut, but I would have said the same for Ike, and he got back in (Also Ike was my main so I rejoiced after I heard that) so Lucas doesn't seem out of the question anymore, but I would say the chances are 70% yes and 30% no
Falco, you may as well call this Falco/Wolf, but not both of them. I feel that one of them will get cut and the way I see it Falco is a much more popular character than wolf but who knows, wolf may make a return
G&W, Ever since the teaser in the PacMan trailer, it's a near guarantee
Captain Falcon, Now if Captian Falcon gets cut, the Wii U will die, DIE, nobody will buy the game if Falcon gets cut and there will be petitions all over the Internet, Riots outside of Nintendo's HQ, and other awful things if falcon gets removed, besides, if you need more reasonable evidence, he is part of the N64 12 so I guess that makes him an obvious pick
That wraps up the veterans now it's time for the newcomers
Dixie Kong, in all honesty, I would rather see K Rool get in, but he has been ignored for quite a while by retro, and Dixie recently came back for the new DKC game, so I think Dixie will get in, and no, she won't be a Diddy clone
Shulk, ever since Xenoblade Chronicles was released and became a hugely popular game globally, Shulk almost seems like a shoe in for SSB4, and with Xenoblade Chronicles X coming out in 2015, this would be a good way to make the Xenoblade series even more well known, so I think he'll get in
Lucina, everyone and their mother is worshiping the gematsu leak as if it is the new helix fossil and saying it is confirmed true, and before nintendo's e3 event, I would say I was one of those people, however when Reggie was talking about Amibos (The NFC figures) there was a screenshot of a lot of Nintendo characters that would show how many Amibos there would be, and one of those characters was NOT Chrom, instead one of those was Lucina from fire emblem, and all of the other characters, at least to my knowledge, were announced for ssb4 except for Lucina and G&W (Which gives more evidence for G&W) so who knows, maybe I'm overreacting, but I think that Lucina is more likely than Chrom
Isaac, Isaac, to me, seems like a character that fits smash very well, he was already in brawl, but only was an assist trophy, but little mac was also an assist trophy and he became a character, also the first golden sun GBA game was released on wii u virtual console so the series probably grew in popularity when that happened, and there is one more GBA golden sun game so I think that putting him in smash would be a good way to promote releasing the second GBA game on Wii U
Chorus Kids, in all honesty, out of all of the characters on this roster I made, the chorus kids are the ones I think are the least likely to get into the game, the only reason I put them on is the gematsu leak but even I have doubts on that
Captain Rainbow, If I remeber correctly one time Sakurai said that Wii Fit Trainer wouldn't be either the unexpected character in the roster, or the joke character, but either way, I think that sakurai, and the mad man that he is, would do something like this, seeing that we have seen characters like Ness in 64, Game and watch and the fire emblem characters in Melee, Pit and Rob in brawl, these were all characters we never would have expected to see, and their appearance in smash boosted global popularity and in some situations moved those franchises over seas, so I think that if Sakurai put him in, it would be a good way to boost global interest in his games
Rayman, to be honest, back when Rayman legends came out, he seemed like the perfect character for smash, but now he seems kind of less likely, I think that if Rayman Legends stayed as a Wii U exclusive title, then he would easily be in, but now it seems like he has a 50/50 chance and honestly the only reason I put him in is because I needed to fill up one more empty slot in the roster
So that is my list, feel free to tear it to shreds if you really want to!