The two-disc package includes the original movie, as well as a "Reformat the Planet 1.5" featurette that follows up with the next couple of years of the New York chiptune scene (a clip of that can be found after the break). The discs also have music videos and songs from some of the included artists.
In addition, 2PP partnered with Fangamer to create some lovely merchandise that can be purchased in bundles with the DVD. If you want to look like a person who knows a lot about music made with Game Boys, you can buy a shirt, square buttons (how is this possible?), a poster, and Blip Festival DVDs and CDs. Then you can watch the movie and actually know a lot about it!