As some of you may be aware, most Japanese releases are often announced with their catalog numbers and barcodes determined well in advance of their release. Usually this data remains the same up to the final release date; however in some cases the catalog number and barcode may change in that time. I am not sure how to handle this situation. On VGMdb the standard practice is to preserve this information by marking the release with the original cat. no. and barcode as cancelled and add a note linking it to the version that was actually released; here on MusicBrainz, we do not have such a flag, so I am torn as to whether to edit the existing entity with the updated information (and preserve the original catno and barcode in an annotation) or just add a new release with the updated information and add an annotation explaining the situation. Someone told me a long time ago that MB will never store cancelled release data because it is beyond our scope; however there seems to have been a paradigm shift since then, as evidenced by STYLE-471.
EDIT: I have entered a series of edits taking the first course of action I listed above. I left them votable because I honestly have no idea what is correct.