iOS 14 Beta 2 brought an extremely useful feature for improving Wi-Fi privacy & security. From now on your iPhone and iPad that run iOS 14 and iPadOS 14 respectively will use a random MAC address for every new Wi-Fi network you join. This will prevent the admin of the hotspot or server from tracking your device.
As I understood, the unique random MAC will be used for each network. This will be especially useful when connecting to public hotspots because from now on you can opt to not expose the real physical address of your Wi-Fi module.