the GTA 6 map will be made up of “multiple big cities which players can travel across”. ... the leaker suggests there will be (at least) two cities, which will be based on the east coast USA instead, with Liberty City (NYC) and Vice City (Miami).
The leaker gives some very basic, yet intriguing details on how the story is planned out currently, explaining that “[Y]ou will start as a small time guy in Liberty city doing odd chores and small-time thefts and eventually work your way to Vice city where you will join a famous gang.”
The end goal is to become ‘the drug lord’, according to the leak. Clearly, this is a fairly skeletal story outline at the stage, and even if accurate, could change in the development process.
Finally, the post also claims that current-gen console hardware will be incapable of handling the scale of GTA 6, and so it will be released on next-gen only: “This game cant come [out] for PS4 because of memory restrictions.”