If you've joined Apple's free beta program, you'll receive the iOS 12.2 software as an over-the-air update. The public beta will likely go live for all testers at 1pm ET. It's arriving a few days after a beta for developers and a week after the official launch of iOS 12.1.3, an incremental update.
The iOS 12.2 software most notable brings AirPlay 2 and HomeKit on third-party TVs, as well as a revamped TV remote in Control Center. It also includes some changes to the Wallet app, Safari, and the Downtime feature in Screen Time. Learn more about the software from here.
Keep in mind the first developer beta of iOS 12.2 - which, again, rolled out a few days ago for developers - included evidence of a new generation of AirPods, an Apple News subscription service, new iPads and an iPod Touch, and more.
We expect Apple to also release the tvOS 12.2 public beta and the macOS 10.14.4 public beta on 28 January. The macOS Mojave update can be downloaded using the Software Update mechanism in the Mac App Store after joining Apple's public beta test. The software will include support for Touch ID-enabled Safari AutoFill and automatic Dark Mode themes in Safari, among other things.
Similarly, the tvOS 12.2 public beta can found by going to the Settings app on the Apple TV and navigating to the Software Updates section under "System." You'll need to switch on "Get Public Beta Updates". After that, your Apple TV will download the beta. TvOS 12.2, when used with iOS 12.2, will let you ask Siri to play media, like the show Modern Family, on an Apple TV from an iOS device.
Let us know in the comments if you plan to join Apple's free beta testing group and try out its latest software updates before they officially release.