iOS 8 randomises the MAC address while scanning for WiFi networks
The FTC held a workshop this spring about location tracking, particularly the retail analytics kind that this is calculated to thwart.  I spoke there and was the person on the panel categorically opposed to the tracking (though I placed the blame on the wifi device makers for leaking a tracking identifier, rather than the people taking advantage of the tracking opportunity).http://www.ftc.gov/news-events/events-calendar/2014/02/sprin...You can also read the comments that various organizations filed about this:http://www.ftc.gov/policy/public-comments/initiative-516