Thought I'd chime in.
I work in a CD store that deals in mainly used CD's, but we carry new CD's aswell but only current releases and old stuff that we rarely see traded in which compliments our stock (and spreads good music).
Anyway, the Animals: Retrospective cd on ABCKO is one of those CD's. It has sold like crazy in our store, we get replenishments in every order each week.
It used to come in a digipack (cardboard case). This version is 2 channel SACD/CD hybrid. Sounds amazing, really good mastering. Anyway, suddenly we started getting it in a regular plastic jewel case, and I do believe the SACD symbol is missing on the back, whereas the digipack version has the SACD symbol (I've got it in my hands).
I noticed another CD that had the DSD symbol on it but no SACD symbol, a Sam Cooke best of.
So I don't know if DSD equals SACD. The Animals cd in my hand right now has both SACD and DSD and Direct SBM symbols on it. I have a feeling DSD and SACD are different things, and that the lack of SACD symbol indicates that it is NOT SACD, but used the same mastering methods etc. so perhaps equivalent to the "20Kbit" thing eg. CCR.
One thing you can do is look at the discs playing surface. If it's goldish colour like a DVD than it's a dual layer dics and likely a SACD/CD hybrid. If it's silver, then they've probably dropped the SACD layer but used the same master, hence the DSD symbol.
Let's be frank, who could blame any record company from dropping SACD, very few (like less than 1%) of people, who are into music, have even heard the term, much less know what it means or how to take advantage of it.