Yes, Jeffrey, you're right that Queen DVD-A has only DTS 5.1. But speaking about DVD-A overall, it's possible to have DD also. As DVD-A it’s very open format, it’s on manufacturer to choose, what kind of tracks will be on concrete disc.
So we can expect different types of tracks on different DVD-A discs. And, to be true, just now I’m speaking only teoretically, as I have only two Queen’s DVD-A.
If you have time look at this:
http://www.soundandvisionmag.com/idealbb/view.asp?topicID=27691
Have a fine day.
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I'm glad I read this, because now I know what DVD - Audio means!