Fraxinus
chunky plant goop
Most-likely, some form of a battle with Lord Ghirahim. Well, we do know that Link has a short skirmish with him in the first Temple in the game, but thanks to the GDC trailer that was released in early March of this year, we also know that Link does meet up with him once again in another temple--and that time faces off with Ghirahim whilst he is controlling a statue. (Actually, that statue to me, looks an awful lot like the statue of the goddess that was shown on Skyloft in Skyward Sword's E3 2011 trailer.) And then, we are also aware there is a third battle that takes place in Skyloft when we note the background of the end of the E3 2011 trailer is "ruins" of a certain part of Skyloft, so... well, it will probably be with Ghirahim.
However, there is still word that Ghirahim is not the sole villain of this game. I don't know if Nintendo themselves said it straight-forward, or if it was an interpretation of one of their "indirect speak" that they seem to do with unreleased games, but nonetheless... there is still a slim chance it will someone or something other than Ghirahim.
Just know that it will not be Ganon/dorf. Taking place roughly 100 years before Ocarina of Time, he would not have been born yet since the sole Gerudo male would be born each century. And if he were alive, he would have not yet have obtained the Triforce of Power, so if he were to be defeated, he would have died as easily as anyone else.
However, there is still word that Ghirahim is not the sole villain of this game. I don't know if Nintendo themselves said it straight-forward, or if it was an interpretation of one of their "indirect speak" that they seem to do with unreleased games, but nonetheless... there is still a slim chance it will someone or something other than Ghirahim.
Just know that it will not be Ganon/dorf. Taking place roughly 100 years before Ocarina of Time, he would not have been born yet since the sole Gerudo male would be born each century. And if he were alive, he would have not yet have obtained the Triforce of Power, so if he were to be defeated, he would have died as easily as anyone else.