AT&T has announced that Lumia 1520 will be receiving Windows Phone 8.1 roll out starting today. They have posted a video of features that the update brings to Lumia 1520.
Post Lumia 625 and Lumia 925, which received Lumia Cyan en masse, Lumia Cyan has been rolling out to Lumia 1520 in India, Finland and even UK. It was widely expected that AT&T may be the first US carrier to go ahead with the update.
You may like to read some of earlier posts for any help required,
[Just updated to Windows Phone 8.1 (Lumia Cyan)? Here is your guide to Niravana!!]
For catching everything about Lumia Cyan and Windows Phone 8.1 which includes:- Full Changelog, Hands-on demo videos, Tips, Tutorial no better place than our dedicated Lumia Cyan and Windows Phone 8.1 page.