iOS 11.3 beta features: multi-room AirPlay 2, Face ID checkout prompt

If you haven't yet had your fill of news about the first iOS 11.3 developer beta, don't worry because there will be more to come as developers and users take it apart to discover unannounced features. Take, for example, these two new ones. It seems that Apple has finally gotten the ball rolling on pushing out AirPlay 2 after months …