Apple CEO Tim Cook announced that the company will improve the security of its solutions, including iCloud, starting from extension of 2FA mechanisms. The login to iCloud service from iPhones and iPads will be allowed to users is possession of the couple Apple ID and password, plus the an authentication code sent to the device through SMS or generated at the time of sign-up. The introduction of the two-factor authentication will be effective with the iOS 8.0.0 version of the iPhone and iPad.”]
Source: http://securityaffairs.co/wordpress/28130/hacking/tim-cook-apple-2fa.html