I dunno, I just finished Twilight Princess, and the Ganondorf boss fight was "cloned" from the Armored Knight fights, if you want to get picky about it. Why would they give him a sword if Link already has one?
As for clones (and as other people have said, we don't even know their moves), I don't find it as big of a deal as you guys seem to take it. Even in Melee they were different enough to give me a different experience when I played as them, and many people grew an attachment to them over the years; making them entirely different would have messed that up, imo.
And while you're all whining about them being lazy, keep in mind they already had to create entirely new fighting styles for Pit, Wario, Zero Suit Samus, Pokemon Trainer, Diddy Kong, Metaknight, Snake, Sonic, Dedede, Olimar, R.O.B. and possibly Luigi. In addition to all the new stages, modes, and music, I'm sure that took up the entire 2 1/2 years of production time. People who want Sakurai fired for "not respecting the fans" after all the work he and his team have obviously put into this title deserve to have their Wii stripped from their person...also, forty lashings.
The only thing they did wrong was reveal so many of the unique characters in the opening trailer, but it was sweet, and as a PR bonanza, it certainly worked. Why don't you guys just think about how you're going to like playing the game in the future rather than concentrating on pipe dreams that the director felt unworkable?