The Address Book UI people picker has been changed for iOS 8. A new mode with new API has been added where the app does not need access to the user’s contacts and the user will not be prompted for access. A temporary copy of the selected person is returned to the app. See ABPeoplePickerNavigationController.h for more details.
According to the iOS 8 Release Notes:
What changes might be necessary in motion-addressbook? Just putting this here for now for discussion later.