GTA 6 aims at giving the players a better and more realistic driving experience as compared to GTA 5 which also includes the addition of new tracks to the plot to perform better stunts. The maps of the game will combine all maps from the previous titles which were suggested by Benzies.
Also, 3 Easter eggs were unearthed in GTA 4 which led to clues about GTA 5 that have led to true features that have been included in the 5th title. Similarly, GTA 5 contains clues about the release of GTA 6. That includes a cargo containing an emblem that is in the shape of the number 6.
One of the visuals includes two tickets to North Yankton but never uses the return ticket which may indicate a lead on to GTA 6 in some way. Also, if the players travel to the Vespucci Beach, a banner is seen which reads “I love VC,” which can be indicative of the fact that GTA 6 could be based in VC also. In the skating arena as well there are clues on a wall which resemble the outline of the city of London, UK.
Hence, there are enough clues about the locations of the title as well as the characters, but nothing has been finalized as of now.