watchOS 2 Beta 2 is a minor update since it only includes bug fixes as well as under-the-hood features compared to watchOS 2 Beta 1. Although watchOS 2 is considered the first major update to hit the Apple Watch, which brought with it some pretty cool new features as well as giving devs even more access to the smartwatch, such as native apps, access the taptic engine, heart rate monitor, microphone, and the accelerometer.
You can get watchOS 2 Beta 2 through Software Update on the Apple Watch. Although to install watchOS 2 Beta, you must first download the watchOS 2 beta Configuration Profile, iOS 9 SDK, and your iDevice must be running iOS 9 beta.
