I have just noticed that DG have recently released Hommage á Sevilla on DVD. Future DVD releases include Les Troyens.
No mention of the Leoncavallo I Medici, for which I was searching following an intriguing post on Opera-L that says
The recording will be conducted by Alberto Veronesi for DGG. Domingo
will sing the part of Giuliano de'Medici, a role created by Verdi's first Otello, Francesco Tamagno...Some other Leoncavallo and versimo recording surprises are also in the works.