I just got done watching and all I can say is, WOW! In 4K Dolby Vision, Spartacus looks stunning, and the DTS:X audio is wonderful as well. A perfect combination. Mr. Harris, thank you SO much for your involvement with the restoration. It is simply superb in every way here. Thank you!
It's DV for sure. I'll have to check my packaging to see if it's buried in there somewhere.
EDIT: Went over the packaging with a fine-toothed comb. No mention of Dolby Vision anywhere, but it IS DV.
Thanks for clarifying, Robert! From what I've read though, the actual cover on the steelbook was newly done for this release. They must have "borrowed" the arm from the archives. :)