watchOS 2 obliges iOS 9 and can be downloaded from the Developer Center or as an over-the-air update through the Apple Watch application on the iPhone by going to General > Software Update.
Apple will release watchOS 2 to the overall public this fall. The redesign brings a couple customer going up against changes unnecessarily including outcast watch face intricacies, custom photo watch faces, another Nightstand mode and Time Travel highlight, and furthermore upgrades to the Activity and Music applications.