Nokishita reports that Nikon registered a new battery charger MH-33 in Korea:
It is difficult to say if this charger will be for the upcoming Nikon Z9 camera (I don’t think so). The Nikon MH-32 model for example was designed for the Nikon Z50 and Z fc. My guess is that the new MH-33 wil be for the next entry level mirrorless camera (Nikon Z30?). All Nikon MH battery charger models can be found here.
Nikon’s not yet announced camera N2014 registered in Indonesia