Due to its relative size and the physical connection to the human body, the Watch OS provides a unique set of features and haptic feedback that distinguishes it from Apple's other operating systems. The second version of the OS introduced some new exciting new features to enhance overall performance.
NEW WATCH FACES
Photos from your camera roll can be added to watches and Time-lapse photography enhances your view of the world
COMPLICATIONS AND NATIVE APPS
There are more options for complications and native apps like Wallet and Contacts have enhanced functionality