The release of the mobile operating system refresh on September 12th has been pushed back to later this year. The notice about the delay was added this week, according to an archive version of the website.
The feature will allow you and up to five other people to automatically share a collection of photos, with the option of including all the photos in your personal library, photos from after a specific date, or that include specific people.
It is not uncommon for Apple to not include features in the initial release. The features trickled out over the next few months.
It is possible that Apple putting iPadOS 16 on its own release schedule has something to do with the feature's delay - it is easy to imagine people setting it up on their phones, then being confused about why it is not showing up on their iPad or Mac The feature deals with photos that people wouldn't want to lose, so the company might be taking some extra precautions. Apple didn't reply to the request for comment on the change in plans for the shared photo library.