I'm new here myself, jellofan, but having beaten you by a week I'll say "welcome". There does need to be clear guidance, we can only hope it happens soon. I also read that part of AC 107-2 and the only thing I'll say about it is that the FAA wants people to be aware of whatever state and local authorities have enacted privacy-wise. They don't say they're all valid and enforceable.
Here in Florida, we have to deal with this state statute, the
Freedom from Unwarranted Surveillance Act. Under Exemptions, there's one for "aerial mapping", which I plan to be doing. The (d) exemption is rather draconian. If you're not operating as part of a business that requires a state license you have to really watch what you're doing to avoid runing afoul of the statute.
Whether that statute is ultimately overturned by the courts or not is something that will take several years to sort out.