Here's My Opinion On Clones
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I liked Melee clones as well. For some reason i just personally prefer when you have two identical characters and you have to explore deeply for their differences then i do having a completely unique character when it isn't necessary. (Pichu, Young Link, Doctor Mario) However, i think that some clones/semi clones need to be elaborated on more to make them stand out while not being 100% unique like Melee Roy and Melee Falco for example. (Maybe perhaps a medium between

and

?) Also, Dark Pit and Lucina should have more stat differences, like maybe lucina has
one new attack and she strikes faster and perhaps Dark Pit should have slower but stronger multi hit attacks and an arrow with more damage/knockback being able to kill uncharged at about 170%, medium charged at 150%, and fully charged at 100%, with an increased charging speed to compensate for his pathetic Electroshock Arm (which should get even weaker because of the arrows).
While others like Ganondorf should be completely unique, having flight, fist, energy, and sword attacks while maintaining balance and Lucas not having PK Thunder but maybe keeping his fire while Toon Link loses his boomerang while still maintaining Arrow.
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As for the DLC.
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I am pretty sure that Sakurai will be reluctant to do it but Nintendo will force him to
because Reggie gets it done.
And with that DLC, we should get Mewtwo, Toad (knowing Sakurai), Roy, and Marshal (lol Sakurai).
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EDIT: @
The Stoopid Unikorn
perhaps saying that it is Mario's dair is a stretch, what i mean to say is that Smash 4 Mario has F.L.U.D.D (a damageless but efficient killing move) and Mario Tornado (Dair good for combos).
Wheras Melee Doc was good, but now is slower, seemingly weaker, (though damage-wise this is false) and Mario Tornado no longer gives him good height (it actually is the reason i die allot now regardless of mashing)
And Doc's Dair just isn't the stuff that it used to be.
Sorry Doc, you had your chance.