on iTunes for $14.99 is The Hobbit: An Unexpected Journey Extended Edition digital download. This only gives you an HD copy of the movie, not a physical copy. With the copy will come the digital special features of the The Appendices Part 7 and Part 8 that provide a detailed look at making the movie. The LOTR Appendices were simply the best behind the scenes extras ever seen as their goal was more documentary of the making the trilogy. Most extras with other movies are really glorified sales pitches. Something that has never made sense as the act of watching the extra makes the sales pitch redundant.
I do not recommend getting the digital version as physical copy will be released on November 5th for probably a better deal as it will be a Blu-ray disc and digital copy (details) for probably around the $20 price. As always you can pre-order from Amazon now: 3D Blu-ray Set | Blu-ray Set | DVD Set | 3D Blu-ray Amazon Exclusive Statue Edition | Blu-ray Amazon Exclusive Statue Edition