I'm waiting for The Wonderful 101 to get a sequel where the OST is even more perfect.
Just to add this, its also important to note that Mewtwo's U-Smash hits on both sides simultaneously, and with its new and improved range, it essentially serves the role of a regular D-Smash, though it hits up high instead of low and has admittedly shorter range. However, all that said, in addition to the edge-guarding utilities, it also looks much more powerful than your average D-Smash, so its possible that it compensates for its one-sidedness with extra power. I personally think that Mewtwo's D-Smash will just take a little bit of getting used to. Once Mewtwo mains have learned how to effectively utilize it, I don't think anyone will ever complain about his D-Smash again.
And, also, I agree about Mewtwo shaping up to be an offstage beast. Assuming that Confusion is truly an auto-Footstool, Mewtwo will probably be a recovering player's worst fear. He has a quick Meteor Smash, an excellent recovery, useful aerials, and, assuming --- is right, an auto-Footstool with added range.
I have a feeling that Mewtwo is going to be the bane of Mac players.