Editor plugin needs to know when a Blueprint is saved?

I am working on an Editor Plugin that uses instances UObjects including Blueprint subclasses which the user will create. I have the pointer to the instance of the Blueprint UObject, but I would like to bind to some delegate that informs me when the package of said Blueprint subclass updates (say the user changes a default value or something), then update my editor plugin to reflect that. What would be the best way to do this?

To clarify what I need even further…I really just need to know when the base object has updated. I have a SDetailsView which shows the properties of the instanced object, which does update accordingly, but I need to know how to hook into the events that are obviously fired from an object when its default properties are update.