Nintendo of Europe has just announced several new details that will be included in Zelda Ocarina of Time 3D. Features such as a Boss Challenge mode and Super Guide will be present. The Boss Challenge mode will treat the players at a certain point in the game with the option of facing any defeated boss or even a continuous battle in which they will fight the each boos one by one. And the “Super Guide” will help players in they are stuck at certain puzzles in the game by showing off a quick gameplay video of how it is done. It was also said that the Master Quest will have a complete mirrored Hyrule to add difficulty to the player’s experience.
Here is a direct quote from NoE.

Players can also take advantage of the built-in gyro sensor of the Nintendo 3DS system, which provides motion controls that allow you to look around your environment when in first-person perspective simply by physically moving the Nintendo 3DS system.
Not only does the full 3D gameplay experience provide easier in-game navigation, but an improved and intuitive interface gives you better control as you solve puzzles, travel through time and explore the immersive land of Hyrule. Players not so familiar with the Legend of Zelda series can also get a helping hand through bite-sized videos available in-game which will provide hints on how to solve the puzzles encountered during your journey.
Fans of the original game will be pleased to know that The Legend of Zelda: Ocarina of Time 3D also heralds the inclusion of two brand new additional challenges not available in the original game: Master Quest and Boss Challenge.
Master Quest mode will see some surprising changes to the game. Puzzles will have to be thought about and solved in new ways from the main Story mode, whilst items and enemies will be found in different locations. The land of Hyrule has also been reversed as locations are mirrored – so what would ordinarily have been on the right now appears on the left and vice versa.
Enemies will also prove more difficult to beat, as such the greater complexity involved in this new Master Quest will test the gameplay abilities of even the most seasoned fans and prove a new experience for all.
The new Boss Challenge mode acts as an extra treat for those players who reach a certain point within the game. It will provide players with the opportunity to face any of the previous Bosses they have defeated once again, or, the option to face and confront them one-by-one, all in a continuous battle.
The game’s graphical re-working coupled with the three-dimensional depth provided by your Nintendo 3DS system breathes new life into this timeless classic. Whether you’re a first-time player or a regular visitor to Hyrule, the engaging, immersive gameplay features of The Legend of Zelda: Ocarina of Time 3D offers a magical new adventure for all.
Source: Nintendo of Europe
Ocarina of Time 3D Master Quest Details and New Features,