Daisuke Wakabayashi writing for the Wall Street Journal in regards to the recent celebrity photo leaks:

To make such leaks less likely, Mr. Cook said Apple will alert users via email and push notifications when someone tries to change an account password, restore iCloud data to a new device, or when a device logs into an account for the first time.

Until now, users got an email when someone tried to change a password or log in for the first time from an unknown Apple device; there were no notifications for restoring iCloud data.

These new notifications will begin in about two weeks and will allow users to act quickly if their account gets compromised.