Since m3 offers activation and approval steps, it would be nice if a user (editor for instance) that submits page for activation (notification) could enter a comment describing what his intentions, changes were.
Administrator ( superuser ) decides if the activation should be approved or rejected and puts another comment that's being returned to the inbox of the user (editor - activator). This is very useful for the rejected activations.

Both comments should be optional in order to preserve the current functionality.