https://www.cnet.com/news/delay-apple-just-removed-32-person-group-facetime-from-ios-12-launch/

Apple promised us that we'd be able to use FaceTime to video chat with up to 32 people at the same time in iOS 12 and MacOS Mojave.

While we're eager to try it, it seems we'll have to wait. Group FaceTime won't release with the launch of iOS 12 and MacOS Mojave, according to Apple build release notes spotted by 9to5Mac and confirmed to CNET by Apple.