MacOS 10.14 Mojave was released yesterday, but Apple began testing the next version. The developer has access to the pre-release version of macOS 10.14.1.
As it is available, it is not yet known in recent versions. That means that Group FaceTime is most likely to return.
Apple promised that Group FaceTime would join Mojave, but pulled that feature in the middle of the beta test process. Perhaps the developer team decided not to be y at the same time as the rest of macOS 10.14. However, the company promised to be in the second half of this year.
The group FaceTime has also been removed from the iOS 12 prerelease version but has returned to the first iOS 12.1 beta version.
In addition, Apple uses this update to resolve bugs and security issues that have definitely emerged since the release of Mojave.
MacOS 10.14.1 only
macOS 10.14.1 beta 1 is available only to users who are registered in the Apple Developer Program. A payment of $ 99 per year is required for this.
Official version will be released soon. Probably as easy as next week. Anyone trying to test potentially buggy software can access it for free.