It's been revealed that The Legend of Zelda: Ocarina of Time 3D, for the Nintendo 3DS, will include something quite special - the Master Quest.
While featuring much the same core content as the original Ocarina of Time, Master Quest contained dungeons which were quite different. While the premise was the same, they were reworked with much harder puzzles. The Master Quest was previously released as part of the special edition version of The Wind Waker.
Nintendo recently revealed that Zelda 3DS wouldn't be coming out before this year's E3, which takes place in June.
Source: Game Informer