Here is a post to gather findings in case anyone found out what this new API does.
Apple did not include any comments or documentation and due to the generic naming we don't know what this API might does.
Has anyone filed a bug about this lack of documentation? If so, please post the bug number. If not, I recommend that you do so and then post the bug number here.
Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"