Recently, a post was discovered on Pastebin made by someone claiming to be a third-party game developer from Europe with knowledge about the PlayStation 5. This post has gained some traction online, despite there being no way to confirm its validity, and it's likely that it is nothing more than a hoax. Even so, there are some that have latched on to the information in the "leak," including claims about one of the PS5's supposed games, Grand Theft Auto 6.
According to the leaker, Grand Theft Auto 6 will launch in holiday 2020, presumably as a PS5 launch title in November of that year, and it will be a one month timed-exclusive for PS5. The leaker also says that Grand Theft Auto 6 will feature not one, but two large cities for players to explore, based on Miami and New York. If true, this would mean that Grand Theft Auto 6 would feature both Vice City (Miami) and Liberty City (New York).
Now, there is absolutely no reason to believe this leak as no sources are cited and no evidence is provided. The most likely scenario is that the leaker is just someone making things up to get the Internet buzzing. But let's examine the claims and discuss how likely they are to be true.
The claim that Grand Theft Auto 6 will launch in 2020 seems very unlikely. Red Dead Redemption 2 just released at the end of 2018 and was a massive undertaking for Rockstar. The game likely took nearly all of Rockstar's resources to produce, and it seems hard to believe that the studio was also well underway on the development of GTA 6 at the same time it was developing Red Dead Redemption 2. For these reasons and multiple leaks that Bully 2 is actually Rockstar's next game, a GTA 6 release date in 2020 is hard to believe.
As for the cities featured in GTA 6, it seems like a safe bet that GTA 6 will be set in Vice City. After all, Grand Theft Auto 4 offered an HD version of Liberty City, and San Andreas was covered in GTA 5. It makes sense for Rockstar to return to Vice City next, and there have been previous leaks pointing to Vice City being the setting for GTA 6. It's harder to believe that the game would feature both Liberty City and Vice City, but perhaps that will be possible with next-gen technology.
PS5 timed-exclusivity is also not out of the question, though seems like it would be a bad PR move for Rockstar, as it would upset PC and Xbox fans. If Sony throws enough cash at the GTA 6 developers, then it's possible, but it still seems unlikely.
Ultimately, any information about GTA 6 that appears on the Internet before Rockstar itself reveals the game should be met with a great deal of skepticism, especially when that information is coming from a random December 2018 Pastebin post.
Grand Theft Auto 6 is rumored to be in development for unspecified platforms.