Feature watch / notification

When the release notes come out I often see info about an Integration that looks interesting, but isn’t available in the web interface. It would be cool to be able to have an “Integration watch list / notification” feature such that when an integration on the user’s watchlist is available for install via the web interface the user gets a nice message about this.

If you are using Image or Supervised I believe the alert to install the new version also links to the Release notes providing that information.

Correct, but this feature request is for items not yet installed (and do not show as available via the web interface), but for which there is an Integration webpage, such as this one:
https://www.home-assistant.io/integrations/whois/

That example is an old integration requiring manual file edits.

I believe all new integrations are required to use the UI but can still have a file editing option too. So all new integrations should appear in the UI,