"Eiji Aonuma, producer of the Zelda series, discussed the potential of downloadable content in the series in a recent interview with Game Informer.
When questioned about the topic, he replied with, “Obviously, we have thought about DLC, and we are thinking about it." This is by no means a confirmation of downloadable content appearing in The Legend of Zelda: Skyward Sword, but it at least tells us that they are considering it
Another interesting piece of information that Aonuma discussed was the idea of online functionality. He commended that online play may not come in the form of multi-player or co-op, but instead through "the idea of communications between players."
This seems like a very interesting concept for the Zelda series. For instance if the Zelda games ever added extra missions to the game through DLC, I might be happy with that. Nice to see that Nintendo is trying to get with the times. We will post more news about this as it continues to develop.