There is the addition of the hero quest, for those out there who breeze through normal mode, but it's not quite the same extreme difficultly that past Master Quests from other Zelda titles have provided. (cogconnected.com)
Ocarina of time 3d is the best version of the game with master quest built in all in 3d with enhanced graphics, gyroscope features etc etc.. (nintendotoday.com)
As expected nothing too exciting in the first dlc, the hard mode is a bit of a let down, I expected something more like master quest, not just a bump in enemy difficulty. (gonintendo.com)