According to Eurogamer, the detail was originally spotted by Nintendo Insider and Neogaf User GhostTrick on the Amazon France information page for Twilight Princess HD, however it has since been removed. The brand new dungeon, called “La Cave du Crépuscule,” which roughly translates to The Cave Of Twilight will be opened only through the Wolf Link Amiibo.
Other Zelda Amiibos will apparently offer assistance to players such as replenishing their hearts and items. The listing also reveals the inclusion of a Hero Mode, and Wii U GamePad inventory management, eliminating having to pause the game to open the menu.
I’m glad to see the Twilight Princess HD version including extra features. Much like Wind Waker HD, Nintendo has taken steps to do more than slap a coat of HD paint on a classic game. However, much like I said with Animal Crossing: Amiibo Festival, I’m perfectly fine with the inclusion of Amiibo specific content, provided Nintendo makes the Amiibos readily available.