The previously reported Nauticam NA-Z50 underwater housing for the Nikon Z50 camera is now officially released. For availability and pricing check B&H Photo.
Technical specifications (additional information available here):
Dimensions: 328mm(W) x 172mm(H) x 120mm(D)
Weight in air: 2.5kg
Weight in water: 0.34kg (incl. camera and battery)