On December 5, 2017, Apple released the watchOS 4.2 software update, bringing the new Apple Pay Cash peer-to-peer payment feature to your wrist and adding other new capabilities.
watchOS 4.2 release notes
Release Notes
tvOS 11.2 release notes
Released on December 4, 2017, the tvOS 11.2 software update brought a pair of new HDR viewing options for Apple TV 4K owners along with access to a brand new Sports tab within Apple's TV app and assorted under-the-hood changes and fixes.
iOS 11.2 release notes
Aside from nearly two-dozen bug and security fixes and various under-the-hood improvements, iOS 11.2 brings support for the faster 7.5W wireless charging on iPhone 8, iPhone 8 Plus and iPhone X and the Apple Pay Cash peer-to-peer payment feature.
iOS 11.1 release notes
October 31, 2017, Apple released iOS 11.1, its first major software update for the compatible iPhone, iPad and iPod touch models following the initial iOS 11.0 release in September 2017.
watchOS 4.1 release notes
Apple released watchOS 4.1 publicly on October 31, 2017.
macOS High Sierra 10.13 release notes
macOS High Sierra 10.13 was released in September 2017 with new features and under-the-hood enhancements that make your Mac faster and more reliable while laying the foundation for future macOS innovation.