Wi-Fi Privacy
Apple is adding more privacy features related to networking, including requiring apps to request permission before scanning the local Wi-Fi network for new devices, along with the ability to use a private Wi-Fi address to prevent tracking.
The “Use Private Address” feature will be available on a per Wi-Fi network basis, and essentially broadcasts a random hardware address when connecting to that Wi-Fi network, meaning that it won’t be possible for network operators or monitoring devices to identify or track your specific iPhone, since it will appear as a new device each time it connects.