Yes GTA 6 is being developped.
— Yan2295 (@Yan2295) January 2, 2021
No it's not coming soon.
No I don't know when it's gonna be announced or released.
You can stop asking now.
According to him, GTA 6 is in development, and he does not know when it will be presented or released. He also noted that users do not have to ask about it for now. It can be expected that if new data emerges, the insider will publish it.
There, the fact of development is confirmed, but nothing else is currently unclear.