Originally Posted by SoZo
Send out an email notice to a subscription list? Post a notice on your website?
While that is one way of informing users that updates are available. That tends to lead to out of date installs and people falling behind on critical things.
Not the WordPress way as I think of it.
Right now in some of our plugins that we don't host on wordpress.org - we have the repositories on github...and just use the github api to check for new tags and then display an update message on the users side and let them click automatic update.
Going the other route has led to users falling several versions behind, missing critical security updates, bug fixes, major versions, etc.
Whereas this may not be such a big deal with Child Themes, it MAY actually turn into that.
Lots of people were using TimThumb and a critical exploit was found in that which compromised servers.