The HD Zelda demo was just the beginning. Now we know for sure Link is getting an all-new HD adventure.
During the Nintendo Direct video presentation, producer Eiji Aonuma stated that with this all-new Zelda title, it will "rethink the conventions of Zelda". He stated that they want to perhaps get away from linear ideas of completing dungeons in a certain order and Zelda titles being a single-player-only experience.
There is little information on this title right now, but stay tuned as more information becomes available.