The Nikon MB-N10 is an upcoming battery pack for Nikon Z6 & Z7 full frame mirrorless cameras. According to NR, this battery pack is expected to be announced soon. This battery pack has already registered in Korea several months ago.
MB-N10 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.