For the first time ever a Legend of Zelda game will be getting DLC. Releasing with the game the DLC pack will cost $19.99 and have three release structures.
The first will be on March 3rd with 3 bonus Treasure Chests, the second, sometime in the Summer of 2017 will have a New Cave of Trials Challenge, A New Hard Mode (I’m thinking Zelda meets Darksouls) and Additional Map features, which Nintendo did not go into details on. The last pack will release in the holiday season of 2017 with a new original story (which might make the price worth it), a new dungeon, and added challenges.
I’m sure Nintendo will update us as to what the summer and holiday packs have in store for us the closer we get to their releases.