watchOS 3.1.1 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 must have 50 percent battery, it must be placed on the charger, and it must be in range of the iPhone. watchOS 3.1 requires an iPhone running iOS 10 to install.
It is not yet known what new features might be included in the watchOS 3.1.1 update, but we'll update this post with any new discoveries. watchOS updates are often minor in scale, focusing on under-the-hood bug fixes and performance improvements.
watchOS 3 completely overhauls the interface on the Apple Watch, introducing a dedicated app dock, instant launch apps, new watch faces, and new complication options. There are new Activity sharing features, a "Breathe" app guides users through deep breathing sessions to cut down on stress, and an SOS feature can automatically call emergency service.
For more details on what's new in watchOS 3, make sure to check out our watchOS 3 roundup.