"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
Apple Seeds First Beta of iOS 12.1 to Public Beta Testers With Group FaceTime
Beta testers who have signed up for Apple's beta testing program will receive the iOS 12 beta update over-the-air after installing the proper certificate on an iOS device.
Those who want to join the beta testing program can sign up on Apple's beta testing website, which gives users access to iOS, macOS, and tvOS betas.
The iOS 12.1 update reintroduces Group FaceTime, a major iOS 12 feature that was pulled during the beta testing period because it needed more work. Apple promised to deliver the feature in an upcoming update, which looks like it will be iOS 12.1.
Group FaceTime is designed to let you audio or video chat with up to 32 people at one time on an iPhone, iPad, or Mac. Calls can also be answered in an audio-only capacity using an Apple Watch or the HomePod.
There are other features that Apple has said are coming in future betas, including eSIM support and the ECG functionality and app, but those do not appear to be present in iOS 12.1, nor do new emojis that have been promised for the fall.