You should already be able to use the face gestures on Android 7.0 and higher devices now, as the updates were approved and are available. Unfortunately, I've gotten a number of reports of PDFs not loading properly with the latest iOS update. It turns out there is a conflict with Google's face detection library and the PDF library I use. This means I have to remove all the changes I made to support face gestures on older iPads until I can resolve this (which is not going to be easy).
Mike
Mike