Apple has just released its first beta of watchOS 2.2 for the Apple Watch, and registered developers can now download and install it. This beta release comes just over a month after Apple pushed the official watchOS 2.1 release. At this time, it is not known exactly what is new in this build, or what changes we can expect.
You'll need to be a registered developer with an iPhone running the latest iOS 9.3 beta release to grab this update. Once you've updated your phone, you can head to the Apple Watch app, then head to General and then Software update.