Well, i visited QOL Page and "discover" an intresting section about the LIVE band, yes i know we have queenlive.ca but is nice to see the official page shows this kind of information (Mainly from the forthcoming Greg's Book) link
In the 1976 section we can read this about Hyde park gig:
"This show, one of the many milestones in Queen's touring life, was
filmed in it's entirety, but has yet to be released officially"
Yes i know maybe there isn't nothing really new there,but i think it's a step on the right side!
Cheers!