I keep a close eye on DVD/Blu ray releases and I keep meaning to share them here. Amazon UK (other sites are available) have a number of upcoming DVD/Blu-ray releases available for pre-order:
The Merry Widow, National Ballet of Canada, Karen Kain/John Meehan/Raymond Smith/Yoko Ichino. This was previously available on VHS but think it's the first time it's been released on disc.
DVD
Blu-ray
Caravaggio Special Edition, Staatsballet Berlin, Vladimir Malakhov/Polina Semionova. Looks like a re-issue of the 2009 release, with the addition of an audio CD.
DVD
Blu-ray
Napoli, Royal Danish Ballet, Alexandra Lo Sardo/Alban Lendorf/Benjamen Buza. A new staging by Nikolaj Hübbe and Sorella Englund.
DVD
Blu-ray
Cinderella, Mariinsky Ballet, Diana Vishneva/Vladimir Shklyarov. This is the Ratmansky version, interestingly it looks like this is only going to be released as a DVD/Blu-ray combi pack.
DVD + Blu-ray
All due for release on 25th September except Cinderella which is 2nd October.