The most timely update to the site is the inclusion of a Face ID security white paper. This 6-page PDF goes into impressive detail on how Face ID works, with an emphasis on privacy and several interesting details to be gleaned. One of the feature tidbits is a comprehensive listing of when your passcode will be needed in place of Face ID. Passcode input will be required under the following circumstances:
• The device has just been turned on or restarted.
• The device hasn’t been unlocked for more than 48 hours.
• The passcode hasn’t been used to unlock the device in the last 156 hours (six and a half days) and Face ID has not unlocked the device in the last 4 hours.
• The device has received a remote lock command.
• After five unsuccessful attempts to match a face.
• After initiating power off/Emergency SOS by pressing and holding either volume button and the side button simultaneously for 2 seconds.
Other sections of the document confirm that any third-party app currently supporting Touch ID will automatically support Face ID without any user or developer changes. Also, Face ID can be used for all the same things as Touch ID, such as purchases from the App Store, iTunes Store, and more.