I just updated several iOS devices to iOS 14.
• Private Address is turned on by default, and I would expect them to change daily. If you use DHCP reservations or other router action based on MAC address, you'll need to turn Private Address off on relevant devices for relevant networks.
• MAC addresses are not local and do not appear to necessarily fall within any particular vendors' OUI ranges.
g0b
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We may need Apple Staff to reply for an authoritative answer, but after more investigation, daily Private Addresses do seem to have the local bit set, but not necessarily in any of Apple's OUI ranges when de-localized.
When Private Address is on, Probe Requests seem to use the daily local random MAC address when connecting to a network and the target SSID is present in the request. When Private Address is off, Probe Requests seem to use the iOS 13 behavior of using frequently-changing local random MAC addresses.