Is your feature request related to a problem? Please describe.
The content updates are invisible to end users. A user is more likely to click a playlist when they can tell that content has been added (New) or has been updated since the last release.
Describe the solution you'd like
Some clear indication of the status of the content. The JSON file includes references to "New" "Updated" or "Retiring" content.
Describe alternatives you've considered
Short of this, a page index of added, updated, or retired content would be helpful. You could make it available to end users as part of the catalog.