Idk, with all the energy and secrecy they put into these events, why would they spoil it? I think they know the magic of the event is not knowing that "one more thing." Sure, with apple's leaky supply chain we can expect hardware details to come out, but full software release with art assets and animations fans used to mock up the FaceID setup process a few days before the event? I can't imagine Apple wanting that stuff in the wild.