Believe it or not, this leaked picture might be the Nokia Lumia 1520, a 6-inch Windows Phone that might be coming our way soon. If the rumors are correct, it should sport a Full HD screen and a Quad core processor and a 20 MPX PureView camera.
There are not much details from the picture. It only shows that more tiles can be added horizontally. Other than that, it shows a flip cover that seems to resemble the iPad (can fold to become a stand).
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(source)