Apple is working to pack a wide range of features in a watch such as, third-party complications, a way to locate a lost watch and several health features, including sleep tracking.
However, it's not clear when the new features will be rolled out to users, reported The Verge.
Third-party access to complications may mean that Twitter will soon be available on the Apple Watch.
Under the Health & Fitness section, Apple is working on heart rate sensor. The feature uses the current Apple Watch's functionality of heart rate sensor and allows users to know of an irregular heartbeat.
The firm also seems to add blood pressure monitor, glucose/ blood sugar sensors and other sleep tracking features to its watch in future.