Once the proper configuration profile has been installed from the Apple Developer Center, the new watchOS beta can be downloaded through the dedicated Apple Watch app on the iPhone by going to General > Software Update.
To install the update, the Apple Watch needs to have at least 50 percent battery, it must be placed on the charger, and it has to be in range of the iPhone.
watchOS 6.2 introduces Apple Watch App Store support for in-app purchases, which will allow developers to create and sell Apple Watch apps that offer in-app purchase options and subscriptions.
Code in iOS 13.4, the companion update to watchOS 6.2, suggests that both the iPhone and the Apple Watch will in the future have a "CarKey" feature that will let them be used in lieu of a car key to unlock NFC-capable vehicles. It’s not clear if this feature will be available when watchOS 6.2 launches, but it is in the works.