Comment 1 for bug 1638769

I agree that this information is needed by the clients.

The question is about the icon: the client might be unable (due to apparmor confinement) to read the provider icon, especially if this is coming from another click or snap package. If, as I understand it - please confirm this - the storage framework will be running inside the unity8 snap, then this is not a problem for your specific use-case, but it's an issue that anyway we need to consider for third party clients.
I guess that for the time being the simplest solution is to simply have an "iconName" field with the icon name as a string, and later on we'll think of a solution for the general case (I hope we can find something better than passing the icon data over D-Bus!).