It seems as though some new content for The Legend of Zelda: Twilight Princess HD will be locked away behind some physical DLC.
This was discovered via Amazon France (via NeoGAF), where a description was found for a new dungeon called “The Cave of Twilight,” which only those who own the Wolf Link amiibo can unlock. The description has since been removed from the page.
The Legend of Zelda: Twilight Princess HD will be releasing on March 4th in North America and Europe and on March 10th in Japan.