GTA 6 (Grand Theft Auto VI) is Rockstar Games’ rumored sequel to GTA 5 (Grand Theft Auto V). GTA 6 will likely be released for Xbox One, PlayStation 4, and (If like Grand Theft Auto V) PC at a later date.
While GTA Online was Rockstar Games’ immediate focus following the release of Grand Theft Auto V, but the studio is already considering possibilities for GTA 6. “We’ve got about 45 years worth of ideas we want to do,” according to Rockstar president Leslie Benzies, “We don’t know what GTA 6 will be, but we’ve got some ideas.”  A leak to Tech Radar indicated that development has begun on GTA 6
Rockstar has confirmed development on GTA 6, and they have stated that they would like to create one Grand Theft Auto game with all previous cities from the series. In an interview with Digital Trends, Rockstar North head Leslie Benzies said he envisions players being able to travel back and forth to revisit places they explored in past games. 
“Of course at some point we would like to have one big world containing all our cities and let the player fly between them and revisit their favorite areas,” Benzies said. “In that context re-imagining Vice City would be very interesting.”