Also, since work had already been completed on Mewtwo before the release of Brawl that would give the development team a head start on his character as well. We don't know how far along Mewtwo got into production, but if that "leaked" image from Subspace Emissary of him is real, then he must of been really close to being viable. At least I really hope so!
Models in SSB4 are not imported and polished versions of the Brawl ones. Every SSB4 model is made from scratch, even if they use the same design. Also, that image was fake.
I'm probably in the minority here, but I don't really want Mewtwo's Mega Evos to factor into his moveset at all.
You're not alone. Mega Evos are, for the most part, kind of dumb looking. I wouldn't actually mind if it was part of his final Smash, however, because I usually don't play with Smash balls. Besides, when it comes to items, any silliness goes.
How do people want Mewtwo buffed in this game from the Melee version? Added weight, speed, altered movesets?
Faster, heavier, new Side B. As you said, Project M did a bang-up job and I wouldn't mind if Mewtwo was kind of like that in SSB4.
I never said he was a clone. I just put him in the same generalized group.
Several characters in Smash share a kind of fighter archetype. This doesn't mean they're too similar, or that their inclusion is redundant. Sheik, Wii Fit Trainer, and Greninja all fit that lithe ninja athlete feel, but they're clearly very different in practice. I want you to play Mewtwo in Melee (or Project M), then play Lucario in Brawl, and see how they are both a very different experience. If you haven't changed your mind, I just don't know where you're coming from.
Besides, if Lucario really was so derivative, this "Mewtwo is too similar" phenomenon would be the first time I've seen people fail to defend the original. That's like saying Falco should be cut because "Wolf is his spiritual successor."
Ah, sorry I didn't see those. What would Mewtwo's Final Smash be though?
Just a guess: Mewtwo transforms (either randomly or depending on version) into one of his Mega Evolutions as a purely cosmetic feature, flies slightly into the background, then performs Psystrike. Psystrike looks kind of like its in-game animation, in which Mewtwo shoots out a saturation of small Shadow balls that hang in mid-air, then once he is done they zoom inwards towards a reticle, a la Snake's final Smash, to hit enemies. Think Dragon Ball Z's "Hellzone Grenade."
Lastly, I believe that if Pokemon hitting 6 reps is a given, Jigglypuff is absolutely not getting cut. Because really, who else would they add to fill that last slot if Mewtwo was in but Jigglypuff was cut? Genesect?