Belfiore: Only the Nokia Lumia 1520 might have the necessary hardware to run Miracast
Nokia Lumia 1520 phablet might be the only Windows Phone model that will run Miracast. Of the two new models that have been announced by Nokia, the Nokia Lumia 930 meets the hardware requirements for the screencasting service. That unit will have Windows Phone 8.1 installed out of the box.
Moving forward, we would expect Microsoft to release Windows Phone handsets with the necessary hardware requirements to make them compatible with Miracast. The technology allows smartphone users to mirror the screen on their device onto a television screen, sans wires.
source: @joebelfiore, NokiaViews via GSMArena