Apple is sending out emails via iTunes Connect that urge
developers to opt into its upcoming Family Sharing program. The emails in part describe the program, which allows up to six people to access the same photos and calendars, as well as digital content bought from Apple, so long as it was purchased under the same credit card. Family members can also track each other's locations if devices are under the same account.
Perhaps more significantly for Apple, Family Sharing includes new controls that will allow parents to approve or reject purchases made by their children. The company has had to deal with numerous complaints about the way in-app purchases are currently handled at the App Store, which in some cases has resulted in children racking up hundreds or even thousands of dollars on their parents' credit cards. Widespread support for Family Sharing should reduce the likelihood of refunds and lawsuits.
Family Sharing is closely tied to OS X Yosemite and iOS 8, both of which are due to release in the fall.