The Nikon N1404 camera was initially registered at the Indonesian Communication Agency Postel back in 2014. The N1404 model most likely corresponds to the existing D750 DSLR camera – see page 2 of the D750 manual:
The interesting part is that the Indonesian Communication Agency Postel has a new listing for the same Nikon N1404 camera dated from yesterday (April 21st):
Could it be that Nikon is planning to make a quick refresh of the D750 by just adding SnapBridge and that’s why they are using the old N1404 code name?