Source: Apple
SharePlay won't be coming out when Apple rolls out iOS 15 in the fall. The company informed developers that it would disable the feature in the subsequent betas of iOS 15, iPadOS15, tvOS 15, and macOS Monterey. The feature allows users to enjoy content together simultaneously and sync what everyone sees on their Apple devices.
According to Apple, SharePlay will return "in future developer beta releases and will launch to the public in software updates later this fall." As The Verge noted, this is the first prominent iOS 15 that's being pulled back from the launch release, and it leaves us to wonder what else won't make its debut when iOS 15 is rolled out. Universal Control hasn't been included in any of the summer beta releases yet. Apple has done this before with promised features until they're more polished and ready to go.