Kovid does not want tons of people thinking they need every update and downloading patchreleases -- says if they need it they will find out when they say something here and are told to redownload.
Currently calibre will not popup a notification if there is a patchrelease, so the infrastructure is there to accomplish this.
The other concern is linux distro packagers get the most use out of it -- but they aren't officially supported anyway.
Does he feel it is worth it to integrate that into his release automation.
I hope so.
The DOCX plugin will also appear, but that at least is turned off until it's ready, running from source on Windows I got some errors looking at the Open With option when it wasn't properly impemented yet.