Few thoughts:
1) VERY surprised there is no definitive making-of docs here. Fans always said, wait for the super-duper boxset and you'll have the ultimate behind-the-scenes type of stuff. No such luck. It looks like some of the stuff from the previous DVDs is being carried over but the best things, the full-length docs, are being left out. I realize the OT only has limited footage to work with but there was a full-time camera crew on the prequels.
2) Impressed that the classic docs are being put on here. Nothing new for us, but a lot of people haven't seen them. Unfortunately, they are 1970s and 1980s video masters, and not likely to look much better than what was on the LDs. Not much you can do about that. Maybe the footage will be good replacement candidates for the GOUT but I doubt it. Too bad the best one--SW to Jedi--is left out.
3)The new docs are absolute crap. 90 minutes on the 501st??? Are you fucking kidding?? Okay, I know they are an interesting group and do good work. Maybe a 45 minute or a 60 minute piece. But 90 minutes of the disc taken up with this? It feels like they are just promoting them because they are loyal customers because no offence to them, but a lot of them tend to be the most brainwashed of all the SW fans and will spend money on anything with the SW label. The other docs are lame too. There's so much that could have gone on here. That "Mythology of SW" would have been a good candidate if you want a prequel-intensive post-saga piece. Disappointing is an understatement.
4) No new prequel docs. In fact the 9th disc is 100% OT from the looks of it. They are really trying hard to lure us to the disc!
The audio track from archival interviews sounds interesting, as does the extra OT interviews and of course deleted scenes. But otherwise--nothing new, and nothing worth seeing. The PT DVDs are still better for supplements, maybe even the OT DVD boxset. The deleted OT scenes will be the first thing to go up on the internet when this comes out. Download them and save your money. I guess we won't even know if the collars are fixxed until a few days before this actually comes out. And, to be honest, I don't really care.