I received the deluxe 25th anniversary set today. As shown in pictures, both the sticker on the front, insert page on back and booklet inside all said it had DTS 5.1 96/24 surround.
That is not correct as others surmised.
I honestly don't know how they totally botched that, but yeah. It's AC-3 48/24 6 channel. AKA - Dolby Digital.
Regardless of all that nonsense, the 5.1 sounds very nice to my ears. I don't own the DVD-Audio, so this wasn't a stretch to purchase. It's a nice little package (not little in size...a bit larger than an album cover).
It does also have LPCM 96/24 stereo...but I ripped that and it's crap. Brickwalled big time. The DD 5.1 is not, it sounds very warm with nice sonics. The DR on the DD 5.1 is very good, while the DR on the 96/24 stereo is in the tank.
I haven't checked out the 4 CD's yet, but I will. It also has a 180 gram vinyl which looks nice and solid. Overall, a very nice set. The front of the set has the name of the band and album in raised lettering. A nice feature.