There is nothing much left for Rockstar to do in GTA 5 since the game has already been released at all platforms. Now, the word is that Rockstar is already starting work on GTA 6 and the game will be returning to Vice City.
This is very likely to happen since Vice City is the only GTA location that has yet to receive a modern remake. Rumours are rife in indicating that Ryan Gosling will be the protagonist in the game.
Also, GTA 6 is going to be massive since it won’t be coming to the old Xbox 360 and PS3. This explains why the rumours also claim that there will be another location coming to GTA 6 and it will be situated near Vice City. In other words, there will be two cities being offered in one game.
Of course, it is still too early to confirm anything yet. The above are based on rumours and it is best to take it with a pinch of salt.