Nikon filed a patent 201294984 in Japan for a new panning feature that will combine a high shutter speed image of the main subject and a low shutter speed image of the background:
From the patent application (machine translated):
“It has a synchronizer which synthesizes the part of the image corresponding to the main object area and the background and generates a new image composing the extracted part from the main image with the background from the second image”
