Apple has today released version 2.2.1 of watchOS to the public. In this version, like all of the others released today, we find bug fixes and stability improvements. There are no outward facing changes that the user will notice.
To get the version, owners can go to the Apple Watch app > General > Software Update > watchOS 2.2.1. In order for the version to be installed, the watch must be at 50%, connected to its charger, and in range of the iPhone.