Its been rumoured for a while and Nikon this week confirmed that it is coming this year.
I expect it tested fully at the Olympics. A lot of people seem to be expecting a D850 type replacement around the £3000 – £4000 mark. While I fully expect a D850 type mirrorless camera to appear this is not it.
I expect this to be similar to the D6 and a similar price, £6000 – £7000; this is going to shock a lot of people but I expect the tech in this will trickle down to cheaper models. I also do not expect it to be a megapixel monster, I suspect 40MP at the most if its going to have the kind of performance News, Sports and Wildlife Photographers need.