a6400 is WW715296, a7000 / a7S III not Coming Anytime Soon (No New Camera Code Registered Yet)
Sony has just announced the new a6400 (B&H Photo Video, Adorama, Amazon) APS-C mirrorless camera, it is now confirmed that previous registered camera code WW715296 (Registered on 11/02/2018) is the Sony a6400, you can see the above image.