There is an interesting thing in Rockstar Games official website footer. It has four city names: New York, London, Paris and Bogota (the capital of Colombia).
It doesn't make much sense since Rockstar doesn't have any offices in Bogota or Paris, but does have in New York and London. Even if Paris is one of the largest European cities, how does Bogota fit in there? Unless GTA 6 will be located there (along with Vice City).