While new Blu-rays of old movies are sometimes dubious replacements for prior editions (hence the need for this column), box sets released in the high-definition format have thus far been fairly helpful, at least in terms of shelf space: many or most of them forego a lot of the frills and flourishes of their standard-definition iterations in favor of more streamlined packaging. Unfortunately, that's also sometimes extended to their extras, thanks in no small part to the legal entanglements of transferring commentaries and bonus content from one format to another.
Both Warner Brothers and Fox have faced this challenge a couple of times thanks to their ownership/ adoption of the libraries of MGM and United Artists, which until a few years ago issued their own releases. Rocky, which is one of United Artists' premier franchises, was recently released on Blu-ray in The Undisputed Collection, a set that contains all six of the films in the series, but it remains to be seen whether complete also means comprehensive in this particular case.
What's Already Available: