Lumia 1520 will carry a bunch of "firsts" inside, such as the first 1080p display on a Windows Phone, and the first panel of this size, as well as eventually a scaled-down version of the 41 MP PureView sensor, that takes up much less space, yet employs similar photographic prowess, which keeps us warmed up for the next handsets that will come from Nokia after it moves under the Microsoft umbrella...
Source: http://www.phonearena.com/news/Nokia-Lumia-1520-camera-app-screenshot-reveals-there-might-be-new-PureView-tech-inside_id47238
Source: http://www.phonearena.com/news/Nokia-Lumia-1520-camera-app-screenshot-reveals-there-might-be-new-PureView-tech-inside_id47238