It is not known in detail whether incorporate the latest Microsoft operating system, all that has been said is that this year so I would most likely premiere some future update of Windows Phone 8 substituting instead the well-known Lumia 920.
About their characteristics not talk much, it mentions that incorporate an aluminum body eliminating the line of polycarbonate that we were having, with his photo sensor that would be similar to that seen in the Nokia 808 both resolution and technologies, AT & T would be a operators to offer it in late 2013.
The image is only a recreation of a possible Lumia with an aluminum body