Temporal Filtering can be used in Watch Dogs 2 and Reinbow Six Siege. This is the same technique as Checkerboard rendering on the PlayStation 4 Pro.
It renders the game at least at half the number of pixels on the x-axis. Which would in UHD be 1920 * 2160 and thus about 4.15 million pixels.
One pixel is always omitted on the x-axis. A line above the same is offset by one pixel. The empty pixels are filled with information from previous frames.
Visually this crisper than 1620p on a TV but it generates ghosting and Checkerboarding/Temporal Filtering does only look really good at 60fps. Actually it very good with 60fps. Temporal Filtering is recommended for those who want to keep 60fps.
It does not look like native UHD but I prefer Temporal Filtering at UHD clearly over 1620p on a TV. In screenshots the difference looks minor compared to native UHD but in motion they are more visible. Even on my 65' FullHD plasma. On a UHD device it is possibly even easier to recognize. 1800p Checkerboard does not look so good on the TV. Going from 2160p with Temporal Filtering is much better because the pixel mapping is 1 to 1.
I would not use this technique in FullHD. That flimmers a lot more than native FullHD but at least it looks much better than HDReady. However, in Ultra HD it is excellent which would perhaps be different for 100 inch TV devices.
3840*2160 = 8,29 Mio. pixel
3200*1800 = 5,76 Mio. pixel
2880*1620 = 4,67 Mio. pixel
Performance:
http://www.geforce.com/whats-new/guides/watch-dogs-2-graphics-and-performance-guide