Here are a list of hand-on preview, test videos of new announced Nikon D850 DSLR camera (B&H Photo/Amazon/Adorama). This camera will be shipping on September 7th, 2017.
D850 first look from B&H Photo Video:
Nikon D850 hands-on by WEX Photo:
Nikon D850 report by Jessops:
Nikon D850 – First Look | Hands On
First Look: Nikon D850
Nikon D850 hands-on review
NIKON D850 | FIRST LOOK Part 1
Nikon D850 Hands On
Hands on with the Nikon D850
Nikon D850 Menus
Nikon D850 9fps Continuous Shooting