Nikon Japan published a press release today that lists the following products as having an August 28th availability (ship-to-customer) date:
- Z5 camera
- 24-50mm f/4-6.3 lens
- 70-200mm f/2.8 VR S lens
- Z TC-1.4x
- Z TC-2.0x
Whether that will turn out to be true for all subsidiaries yet or not is not clear, but usually Nikon's releases worldwide are within a day or two of one another, worst case.
Update: I expect the next shipment of the 24-200mm f/4-6.3 lens to arrive the week prior.