Over at the site @evleaks, a report about Nokia's (now Microsoft's) smartphone road map for 2014 has been teased with some device names like 'McLaren,' 'Rock,' 'Tesla' and 'Superman.' While 'Rock' is reported to be an entry-level Lumia 530 for T-Mobile and cricket, 'Tesla' and 'Superman' are described as mid-range devices for AT&T and Verizon, though no specifics are given. The Verge has previously described 'Superman' though as having a 4.7 inch display and a massive 5 MP front-facing camera.
I can add to the story quite a bit, specifically some details around 'McLaren.' But first, I should mention that AT&T is slated to get the new green Lumia 1520 sometime in late June or July as part of the Windows Phone 8.1 launch. I don't know if it'll be 32 GB internal or 16 GB, but with micro SD expansion, the ability to install apps and games to the card and 128 GB support, it doesn't matter anymore.