The new plugin manager is great, but it doesn't seem to tell you what has changed when it lists the available upgrades.
Clicking on Plugin Details, takes you to plugins.atlassian.com and on that site there is a 'Version History' (albeit quite basic). Be great to have some release notes/etc available within the Upgrade Manager, to evaluate whether or not to immediately update. (e.g. some plugin may do a change to a macro that is not backwards compatible, etc)
Issue has been raised from Include Release Notes in Plugin Upgrade summary