wifi tracking in mobile phones with MAC address may stop

Concerns about wifi owners spying wifi phones that pass by and transmit their MAC address may come to an end.

Apple iOS 8 is using a new system that generates random MAC addresses, so you cannot be tracked the next time you log into a wifi. 

This is better explained here: http://qz.com/218437/a-tiny-technical-change-in-ios-8-could-stop-marketers-spying-on-you/

We all know that wifi addresses can be spoofed easily, but never heard that it was possible in mobile phones.