https://arstechnica.com/gadgets/2020/03/ios-14-code-reveals-new-apple-watch-features-including-blood-oxygen-detection/

By digging through leaked iOS 14 code snippets it claims to have acquired, 9to5Mac says it has uncovered a number of details about the new features and improvements coming to the Apple Watch later these year when iOS 14 and watchOS 7 ship. Among them are a new blood oxygen detection feature, further evidence of sleep tracking, a number of new Watch face-related features, and the ability for a parent to manage a child's Watch from the parent's iPhone.