Apple today seeded the fourth beta of an upcoming macOS Mojave 10.14.1 update to developers, a little over one week after seeding the third beta and three weeks after releasing the macOS Mojave update.
macOS Mojave introduces a new method of installing software updates, so after the initial beta has been installed using the appropriate profile from the Developer Center, additional betas can be downloaded through opening up System Preferences and choosing the “Software Update” option.
The 10.14.1 update includes support for Group FaceTime, a feature that was removed during the beta testing period. Group FaceTime, which lets you chat with up to 32 people at once, is also present in the iOS 12.1 beta.
Read more at MacRumors