Buried in the latest iOS 12.1 beta code are instructions for users to hold their iPad in portrait orientation so that Face ID can be set up. If legitimate, this code would confirm rumors that Face ID is indeed coming to the next iPad Pro, widely rumored to be announced at Apple's event next week.
https://www.notebookcheck.net/Code-snippet-from-iOS-12-1-beta-all-but-confirms-Face-ID-for-iPad-Pro.346456.0.html