The latest rumor suggests that Nikon will soon announce a new Nikon MB-N10 battery pack for Nikon Z6 & Z7 full frame mirrorless cameras. The Nikon MB-N10 battery pack has already registered in Korea several months ago and it will have similar design to old Nikon and Canon grip. 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.
In addition, According to the Korean Communications Commission, the new Nikon MB-N10 will probably have Bluetooth.
An KCC / MSIP RR ID is the authorization ID assigned by the Korean Communications Commission to identify wireless products in the Korean market. The RR assigns application ID numbers and Authorization number to approved products. The Battery Pack, manufactured by Nikon Corporation and sold by Nikon Imaging Korea Co., Ltd. has an Authorization Number of RR-NKR-MB-N10 and was approved on 2019-06-25 under application number 201917210000159850.