They should release one DVD set with volume 1 & volume 2 on one disk, and then the extras on a second disk. Then they should release a barebones DVD of the complete movie edited together. Because really, to most people, I think seeing the movie edited together would just be a novelty. But on the other hand, if people didn't care about special features and felt it would be a waste to get the two-disk set, then that'd be good.
But I'm willing to bet that it doesn't happen this way. I bet that the DVDs for volume 1, volume 2, and the complete edited-together movie will all be two disks, despite the fact that the bonus material (or at least the stuff that isn't garbage to make the running time on the bonus material disk longer) won't be enough to not have just put on the same disk as the movie itself.
I worked all day today so I got to watch most of this movie again. I just can't not watch it