Here it is, taken from NOE's official site, the story to The Legend of Zelda: The Wind Waker.

"The adventure begins on our young hero's 12th birthday, the tranquillity of Link's island existence shattered when his younger sister is kidnapped by a monstrous bird. Donning that familiar green tunic (which we learn is a birthday gift from his kindly gran), Link embarks on a long, perilous journey to rescue his little sibling."

That's not all, NOE's site has loads of info and screenshots on the highly anticipated title. Check it out.

Source: Nintendo Europe