The big question to me is whether it's enabled by default, and whether it blocks requests to Google Analytics. If so, that's an interesting shot across the bow.
This is actually really concerning to me. If they blocked Google Analytics, it would severely damage that data. It'd be bad news for site owners who just want to quantify their traffic.
I say this as someone who does a lot of analytical research and re-targeting and would be hurt if this was rolled out on a larger scale; I just don't think I have a right to the data.