Here you go. This came straight from the source of Nintendo itself, and you may have seen it floating around the internet before. This one is legit. It's been officially confirmed
Now, as for who that mysterious character is, there is a popular theory floating around that she's some kind of spirit of the Master Sword. Compare the design of her and her outfit to the sword. See the similarities. Also, notice how Link has no sword.
http://s66.photobucket.com/albums/h262/Hylian7/?action-view¤t=Wii_Zelda_e3.jpg
Edit: For some reason, the pic wouldn't show up on here, so I put the link right above this. Just copy/paste it in your browser to see it.
Now, as for who that mysterious character is, there is a popular theory floating around that she's some kind of spirit of the Master Sword. Compare the design of her and her outfit to the sword. See the similarities. Also, notice how Link has no sword.
http://s66.photobucket.com/albums/h262/Hylian7/?action-view¤t=Wii_Zelda_e3.jpg
Edit: For some reason, the pic wouldn't show up on here, so I put the link right above this. Just copy/paste it in your browser to see it.