This is an interesting rumor, if not particularly well-sourced. But hey, it’s Friday night. Anything goes!
It seems someone working in a workshop specializing in carbon-fiber construction has been working on something for Nikon: a “resin-infused 3D woven CFRP body” of the Pro DSLR persuasion. Current high-end camera bodies often use magnesium alloy for structure, though usually it has a rubberized finish for grip and shock resistance. I’m not sure how carbon fiber stands up to current materials, but apparently Nikon thinks it’s worth investigating.
Plus: looks sweet.