Here is an NHK interview with Nikon from the 2018 CP+ show where company’s representative confirmed that the new Nikon mirrorless camera will be brought to market by next spring (2019):
This is not really any new information – the new Nikon mirrorless camera is expected to be released in the next few months (most likely for the 2018 Photokina show in September):
Tamron also thinks Nikon will launch full frame mirrorless camera “in the near future”
Nikon officially confirms they are “developing new mirrorless products”
Nikon’s president confirms new mirrorless camera in an interview