Good, it's public now. I don't have to RTFS because I was there when they announced and described this and had a chance to ask questions about it. It is brand new as of last Thursday and it is not an ARF based FBL. It is a single daily report that will give ESPs an idea of how their emails are being handled by the Google classifier. It will not be useful as an unsubscribe mechanism as it will not include any recipient specific data. Only ESPs are eligible and even then it will be limited as they roll it out and get feedback about the new service.
So, no, they still don't have an ARF based FBL.