While this rumour seems far fetched, it is interesting that Nikon did file for a patent to place a digital sensor into a film camera body some time ago. Around the same time, they filed for a patent for a new 50mm/1.8 manual focus lens.
The idea that the market is too small for a camera of this type may be seen from a different perspective by Nikon. The fact is that the market for small point and shoot cameras is shrinking rapidly, mostly due to the use of smart phones for this type of photography. The market for basic SLR/Mirrorless cameras is being diluted by new models seemingly being announced weekly. It may be that Nikon is looking around at potential products to bring to market that appeal to a more boutique style buyer. Bring many of these specialty models to market, at higher than standard margins, and perhaps Nikon makes up for the point and shoot losses they are experiencing.
I, for one, find the idea of an FM2 style camera being released as a digital camera, specifically for use with AIS lenses, very appealing. I have used the Nikon F line of cameras since the 60's and I still use my FM2n every day. I really enjoy the simplicity of manual metering and manual focusing. It causes me to use my brain and it seems to enhance creativity.
So yes, put me down for one.