It seems unlikely that Dji could get their DJI Mavic 3 out in September, especially with what has happened to the world with Covid 19.
The reason I say that is because they can’t even keep up with demand with the products they are currently selling. Parts are even more of an issue.
The biggest reason I think Dji has allowed this to be dropped all over the internet is a clever tactic to take the light off of Autels Evo 2 starting to do on sale. Dji are known to do this and did a good job of that when GoPro brought out their ill-fated Karma. But anyway read about the rumour here below:
Autel Evo 2 Pro 
DJI Mavic 2 Pro
You can buy both of there in our online shop. Take a look: