The 2.2.2 update 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.
Apple only seeded one beta of watchOS 2.2.2 to developers before releasing the update, which appears to be minor in scale. During the beta testing period, no outward-facing changes or obvious bug fixes were discovered in the update.
watchOS 2 will be succeeded by watchOS 3, which has already been provided to developers for testing purposes. watchOS 3 introduces major interface and navigation changes to the Apple Watch along with new apps like Breathe, new watch faces, and speed improvements that allow some apps to load instantly when opened.