MAC address spoofing feature will be implemented, eliminating the ability of marketers to engage in Wi-Fi sniffing, a burgeoning and increasingly common practice, against users with devices running iOS 8.
"The result is a privacy win for Apple users and a major blow against data marketing ..."
Full article here:
http://www.theverge.com/2014/6/9/5792970/ios-8-strikes-an-unexpected-blow-against-location-tracking