To be honest, I don't really see them adding more Zelda characters. They only have a maximum of four from each series, excluding Mario and spin-offs, and it seems limited to important characters from each series, and of course the staples for Zelda would be Link, Zelda, and Ganondorf. They have had Young Link and Toon Link in the past, though, so I might not be surprised to see a Toon Zelda who transforms into Tetra. That would be pretty cool. I think I read something at some point saying there was extra incomplete character data that was found on Brawl's disc for some extra characters, including all the missing ones from Melee and a few others. I think one of them was Toon Zelda, though I can't remember if there was anything about a Tetra transformation, or perhaps a Toon Sheik transformation. Ooh, I'd be interested to see how Toon Sheik looks.