The Nikon MB-N10 battery pack for the Z6/Z7 cameras will be officially released soon. The grip will be similar to old Nikon and Canon grip designs where the grip goes inside the battery compartment instead of the battery. Batteries will be inserted from opposite ends of the grip in order to allow their seamless replacement. The Nikon Z6/Z7 battery grip will not add a second memory card, it will only extend the battery life.
The Nikon MB-N10 battery pack for Nikon Z cameras was already registered in Korea.