We have known that a flagship Nikon mirrorless camera was likely coming at some point, but tonight, the company has officially confirmed its development and scheduled release for later this year. They have also confirmed some details about the upcoming camera and released an image of the body.
The flagship mirrorless camera, which will be known as the Z 9, was officially confirmed tonight by Nikon. The Z 9 will have a built-in vertical grip, as seen in the image above (though the final design of the body may change). The body will feature a brand new stacked CMOS sensor, new image-processing engine, and 8K video recording, along with other advanced video features. The company calls the Z 9 a "significant advancement in technology and performance to offer users an unprecedented imaging experience and fulfill diverse workflows."
While that is all the information we have at the moment, the company has promised to release more information as the release date grows nearer. I would expect that the Z 9 will likely be tested out at this summer's Olympics (alongside the Canon R1). Though we do not have that much information yet, it sounds as though Nikon intends to go toe to toe with Canon and Sony with the Z 9. It looks as though this year will be quite exciting!