In a surprise announcement, Nokia and AT&T have pushed out the Lumia Black update and new OS patch (Windows Phone 8 Update 3) for the Lumia 1020. In addition, there is a new firmware release for the Lumia 1520. The updates are now live and going out to both devices. Here are the changes:

Nokia Lumia 1020 Lumia Black (3051.40000.134x.00xx) Daily delighters: lock the screen rotation, close apps easily in the app switcher, use custom ringtones for messaging and mail, among other things

Update to Nokia Camera that combines Nokia Smart Camera and Nokia Pro Camera. Available from the Store app.

Get the latest version of Nokia Glance Screen – see quick status notifications, for example, about calendar and messaging events on the lock screen.

Bluetooth 4.0 LE – preserve energy while staying connected via Bluetooth

Get enriched camera performance, enhanced battery monitoring, and other stability and usability improvements

NEW: OS build 10517 Likewise, the Lumia 1520 also received a new firmware package today.