So, there's speculation that the Link we saw in the Wii U trailer might not be Link due to the lack of sword, lack of green tunic or hat, and ponytail. The blue tunic is rather similar to the tunic Link wore in Wind Waker before getting the standard hero garbs, so there's speculation that it might be his sister, which would also explain the similarity. The producer, Aonuma, teased "No one explicitly said that that was Link." This was the best response I saw to it: