It was useful to receive the "Joomla! Update available..." email from my installation just now. I wonder if it would be better to also include a link to the release notes? It's generally not a good idea to just install an update without at least reviewing them, although that is what the email implies when the only suggested action is to click the link to install the update. Perhaps before that, just under the "UPDATE INSTRUCTIONS" title, there could be something like:

Review the release notes at:
....

Perhaps with better wording saying why that is a good idea. I for one would find this useful, and it suggests a more sensible approach to site updates to all who receive them.