The Legend of Zelda series producer, Eiji Aonuma, highlighted during an interview with CNET that the Link to the Past sequel for the 3DS will feature a Light and Dark world much like the original game released back in 1992 on the Super Nintendo. Here is an excerpt from the interview:

But why A Link to the Past? Why not create a new world for Link to explore? Aonuma says that the 3DS has allowed for the revisiting of a top-down world and provided new ways for the player to interact with a Zelda game. It was the perfect chance to reopen A Link to the Past. And like some other Zelda games [...], the 3DS sequel will alternate between a light and dark world.

Aouma also explained that Link’s ability to transform into a thin sheet of paper was inspired by the Phantom Ganon boss battle in the Forest Temple from Ocarina of Time. We cannot wait to get our hands on this game.