Okay so i figured out something.. Thinking about previous Gta Games like Gta III, Gta San Andreas and Vice City from back in the day.. Okay, they were released in 2001-2004 you say, so what, right? But thinking off it.. Gta 4 were again placed in Liberty City, Gta 5 in San Andreas, there is then a good possibility of that Gta 6 will be in Vice City. As i said, it's not confirmed yet.