More faces and features
To gain from its size and location on your wrist, Apple Watch was designed with its own unique operating system — watchOS.
With watchOS 2, it has been refined. There are more faces to choose from. Faster, more powerful apps.
WatchOS 2 gives you multiples ways to make your watch face look and work exactly as you like do.
Reach here http://www.apple.com/watchos-2/