I had the chance to try a preproduction model yesterday. It still has the silly aperture bug.
I tried to look for moire in the video, I could see it on the display of the camera, but when hooked up to a fullHD tv to playback the file it wasn't visible. I couldn't take any footage with me though.
I'm pretty sure it's the same sensor as the D5200 indeed. Interesting is the fact that at the presentation they said the hdmi-out is the same as the Nikon D600. Combine that with the notice on the website and it might mean you get the same black bars as the D600 does. Although that would be weird since de D5200 can output.
Photography wise (it is a photo camera..) it is a pretty big upgrade over the D5200. Sturdy weatherproof body, 51 autofocus points, 6 fps full res and 7 fps in 1,3x crop. Great sports/wildlife camera for the money.