given the massive amount of weapons in Uprising, I don't think that Dark Pit would necessarily be a clone of Pit... then again, Dr. Mario, Pichu and Toon Link could have been different characters if the developers got a little more creative, specially when considering Ganondorf's clone status, which is bad.
only close-minded people make the assumption that similar looking characters are necessarily clones. problem is when the developers themselves are close-minded as well, when making movesets for the characters... but, even so, clones aren't that bad as long as there are significant differences between the characters, but some disagree...
anyway, Palutena's chances are quite favorable, and she has good moveset potential.