NikonRumors has confirmed that the two low light high ISO photos are not taken by a new Nikon DSLR camera, instead these two photos are take by a Nikon D750 DSLR camera with a new 20MP sensor specifically designed for low light photography.
There is currently nothing more talk about this new 20MP sensor. Stay tuned for more info.
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This article (and rumor) is incorrect.
These photos were taken by a standard, unmodified Nikon D750 at 24 megapixels (6016 x 4016 px), as you can see in the full resolution photo that Nikon Rumors posted here:
https://www.flickr.com/photos/nikonrumors/31712562311/in/dateposted-public/
Nikon Rumors confirms this in their article that you linked above:
“As far as I am concerned, based on this photo, this could have been taken with a regular 24MP D750 camera (over the last two days I was told multiple times that the sensor was 20MP and it appears to be 24MP based on the EXIF).”
https://uploads.disquscdn.com/images/20259f2ea3553d6bac9291d7321bc2df2b3e648c8f79503940583ba1efdf990a.jpg
The image size 6010 x 4016 indicates a 24 MP chip.
D5 has 5568 x 3712 -20.8 MP resolution. If the new D760 will have specs as D5, better to use a D5 for testing…