One of the informants of GTA 6 posted a post with a leak from the game itself. In it, he talks about the two main characters of the game.
The author refers to the fact that they will be brother and sister John Leguizamo and model Roselyn Sanchez. According to the storyline of the game, the actions will be carried out in the 80's. Even in GTA 6, new cities will be available. This is a copy of the original city of Fort Lauderdale and the capital city of Columbia.
The information also says that the game should be released at the end of 2021 or even in 2022.