@chapas: That's already kind of the case.
If the revision changed, *something* was updated inside that package (e.g., see the Font Packager experiment, which is stuck eight thousand revisions in the past
). Granted, that something will most likely be a binary for a third-party dependency, because you can safely assume that most everything Kindle-related in there is in maintenance mode, so actual logic updates are going to be rare/non-existent.
If you need actual details, there's a ChangeLog file inside each archive which does just that
.