I recently bought the 30 disc 2011 remasters boxset, mostly for the extras on the second discs since I don't have much of a singles collection prior to The Miracle (from that point on I have most UK CD singles).
There does seem to be some production variation of the remasters, mine doesn't use super jewel cases just the standard older style ones. Bought online from Hong Kong, I left it too late to get a decent price from Amazon (my fault).
I also recently bought the 30th Anniversary A Night At The Opera CD/DVD combo digipack. The surround sound mix is definitely not as good as the DVD-A which I already have, except for God Save The Queen which was an upmix on the DVD-A and is from the multi tracks on 30th Anniversary.
OwenSmith