Yay an SSB4 discussion thread! This is what I miss most on these boards! Teh speculation!
Alright, I've got some ideas:
Better Online - duh. No to very little lag, options to do 1v1s, options to pick stock, and a random stage selector (Like the one in Mario Kart Online, where it displays the stages chosen by everyone, and randomly picks one)
Returning Characters
Mario
Mario
Luigi
Peach
Bowser
Donkey Kong
Donkey Kong
Diddy Kong
Yoshi
Yoshi! (And make him better **** it!)
WarioWare
Wario
Legend of Zelda
Link (Keep the TP look if possible, it looks fantastic, also needs to be better, poor Link)
Zelda/Shiek (also keep the TP looks)
Ganon (Please...PLEASE SOMEONE send Sakurai a letter DEMANDING a Sword based Moveset...if Falco can be decloned, Ganon can.)
Toon Link (Yep, he should stay, maybe a different moveset though)
Metroid
Samus
Zamus
Retro
Pit
G&W
R.O.B
IC's (As much as I DONT LIKE THEM, they'll be back)
Pikmin
Olimar (Also, hopefully he will have whatever new Pikmin are introduced with Pikmin 3)
Kirby
Kirby
Meta Knight
Dedede
Star Fox
Fox
Falco
Wolf
(yeah, I listed all 3, theyre different enough, and who doesnt love them?)
F-Zero
Captain Falcon (the REAL one)
Pokemon
Pikachu
Pokemon Trainer (Same Pokemon)
Lucario (Lucario is very unique, as well as somewhat popular. He's much more likeable than Pichu was, so this 4th Gen rep needs to stay)
Fire Emblem
Marth
Ike
Mother
Ness
Lucas
please, without the CG exploit
Third - Party
Snake
Sonic
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Yes, I left Jiggs out, because I think Jigg's time is up, but I'm most likely wrong
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Newcomers
Mario
Bowser Jr.
Dr. Mario (with the release of another Dr. Mario game (WiiWare) you never know)
Donkey Kong
Funky Kong (Lets look at the R.O.B. thing with Mario Kart...dont believe me? Youre fooling yourself, not only did Nintendo put him in Mario Kart, he was the only other playable besides DK and Diddy in Donkey Konga 3 (released in Japan), so theres obviously favoritism here)
King K. Rool Come on now, DK is TOTALLY deserving of 4 reps, having released more games than Kirby, and Starfox combined. Either way, K. Rool would make a great character, with SUCH moveset potential.... Hopefully, he'll be able to deal with the obvious Funky-favoritism (Not that I dislike Funky, I think they'll both get in)
They could also add Dixie, but I've got no idea what kind of moveset they could give her...seriously, I've got no idea.
Legend of Zelda
This all really depends on the theme of the next Zelda game, as, aside from the big 3, that will determine who gets in.
I'd LIKE TO SEE
Midna and Wolf Link - great moveset potential
Mask Link (HIGHLY UNLIKELY, but I think it was an AWESOME idea. 4 forms, and fierce diety as a final smash? aw yeah!!)
Retro
I'd be pretty cool with
Takamaru - Cmon, they got his music, so they havent forgotten about him
Metroid
Ridley..........
Nothing else needs to be put here.... Ridley...Meta Ridley alt....
(Actually, I can all but guarantee this, because after the Nintendo Power interview with Sakurai, he is now greatly aware that the fans REALLY wanted Ridley to be playable.)
Yoshi
Kamek - This idea was pretty good too, Kamek was a major part of most if not all Yoshi games.
Kirby
Nope, were good here
Wario
Cant picture anybody but Wario to be honest
Starfox
Nope. We got the main protagonist, the protagonist's Luigi-figure, and the anti-hero.
Were good here too. Krystal brought doom to the series.
Pikmin
Er... I dunno, Louie perhaps
Or, if theres a major protagonist that DIFFERS from Olimar in Pikmin 3, I'll vote for whoever they are.
F-Zero
Samurai Goroh. Please.
Black Shadow - Somebody needs to keep Ganon's old moveset, and who better than Black Shadow?
Pokemon
Mewtwo - I dont care if he's an alt for Lucario or not. He'd also be good as a seperate character, he's VERY different from Lucario. He just needs to be drastically improved.
Fire Emblem
Michaiah - More magic users please.
Black Knight - He just seems like he'd be fun to me
Mother
Claus - He'd be a great character as well... Please let him join Smash...
Mii
Mii - I actually think this isnt a bad idea now
MGS
Raiden? He looks like such a badass in MGS4... wow..
Sonic
Knuckles
Maybe Shadow as a clone
Other Third Party
Bomberman
(I never really played any Megaman games, so he doesnt really appeal to me)
And..by some MAGICAL CHANCE, Banjo & Kazooie... I'd take them over K. ROOL **** it!!
Ah wait, other series..
Golden Sun
Isaac. duh
Sin and Punishment
Saki - I'm not the only one who thinks he's not only awesome, be a great character as well, right?
Thats it for the roster.
As far as other features
Story mode that doesnt use original enemies, but uses enemies from Nintendo's past
-Octoroks
-ReDead
-Metroids
-Ekans (Or any other Pokemon)
-Deku Schrubs
(Agh, they had such potential here, and moderately blew it...)
Stages
Gangplank Galleon!!
Retro Bowser's Castle - Come on, fighting on the bridge, avoiding 2-d bowser fireballs, breaking the bridge, lava, etc. etc., race to the axe...aw man, that'd be so great..)
Golden Sun Lighthouse
Rainbow Road
K. Rool's Kopter (DKC2, that'd be a great flat stage)
and more I cant think of right now
Anyway, these are my current ideas.
Gameplay:
1. less floaty
2. more hitstun (less than melee so theres some chance of escaping a combo, but more than brawl so you can actually combo)
3. Keep wavedashing out and L-cancelling (put it in so it automatically does it or not at all)
4. Less airdodges for pete's sake. like 1 per jump (2 in all) and keep it so it isn't directional and you can still attack or whatever afterwords (no "freefall")
5. Give sidestepping a certain duration till you can use the next one, i hate it when people just sidestep over and over and over like 5 times in 1 second so dub that down for sure.
6. I guess more items, even though I don't play with them or smashballs on cause then it's ALL about skill and not getting lucky with a legendary pokemon.
Characters:
Yoshi is good enough (in my hands anyway

), just unnerf his Dsmash, in melee it'd kill at like 100 and had no vertical knockback only alot of horizontal, right now when you hit someone with it it's merely an annoyance and has the knockback of a ftilt, and makes his Fair spike better you can keep the necessary sweetspotting but at least give it more spiking potential it won't even be a lethal spike until 70 percent (make it 50 since it's difficult to land as it is). Oh and keep his egg shield, sure he can't jump out of it but it's unique, maybe give him the abilty to powershield and retaliate like every other character? jumping out of shield isn't nearly as necessary as this. Oh and more super heavy armor frames during 2nd jump, alot were taken away.
Bowser, give his Fsmash more oomph again.
Samus: Unnerf her charge shot, in 64 and melee it was the equivalent of the DK punch now it doesn't kill till about 150% oh and have her bombs explode on contact with an opponent again that really hurt her defense game.
Mario, different down B. maybe one that does damage? all it does now is screw up ness's and lucas's recoveries.
Ness: faster bat, good to go.
Lucas: slower stick, sakurai really loved lucas, at least Ness's PK thunder is actually lethal before 50% while lucas you have to wait till 200s
Snake: nerf his, ftilt. Nerf his Utilt and make the hitbox so that his leg actually has to hit you (I have no idea how they messed that up), get rid of his boost smash he's powerful enough as it is.
MK: give his tornado less priority.
Jigglypuff: unnerf the REST!!!!!!
ToonLink: take him out, obvious clone, alternate costume maybe.
Ganon: new moveset much?
C. Falcon: I hate to say it, but give the knee more kill power (less than melee's though)
MII: Fun for the kids, stupid for tournaments or just anyone over 12. But hey that's what Pichu was in melee, plus I'd try him out, nothing like fighting with someone that looks alot like you unless you're super hot like Zamus (well no one is that hot, NO ONE!!!

). and yes every Mii would have the same moveset.
Mewtwo: need I say more? Just give him a useful DownB, hypnosis was hard to land and nearly worthless, it was like sing but on only one side and they didn't sleep as long
No more spacies.
NO MORE SWORDSMEN. Well maybe just Roy back but that's where I draw the line!!! I can't stress this enough!!!
Levels:
Link castle from 64 (don't remember official name) everyone loved this level.
Pokemon level from 64, think it was cerrilian city, that one was my favorite from the 64.
All the 64 ones that were in melee.
The good ones from melee. not the gay ones where random things happened.
Brawl levels, but only the good ones, and you all know which ones those are I'm sure.