Apple released watchOS 6 back in June with native App Store support, new watch faces, activity trends, etc and following that, Apple has now released watchOS 6.1 update which brings support for AirPods Pro and few other Apple Watch models.
watchOS 6.1 is just an incremental update to watchOS 6 that was released back in June. watchOS 6 supported Apple Watch Series 3 and later at launch and now with watchOS 6.1, Apple Watch Series 1 and Series 2 are supported. This update also supports recently launched AirPods Pro. Apart from this, watchOS 6.1 update includes usual improvements and bug fixes.
In related news, Apple released iOS 13.2 with Deep Fusion, new emoji, AirPods Pro support yesterday alongside iPadOS 13.2 recently.
Apple’s watchOS 6 support page read:
watchOS 6.1 introduces support for AirPods Pro and includes improvements and bug fixes. This update also brings watchOS 6 to Apple Watch Series 1 and Series 2.