I assume it's going to be just Los Santos, but bigger than San Andreas last gen. Was GTA IV Liberty City bigger than San Andreas? I think it was. Ideally I would've preferred Vice City and San Andreas again, but three major US cities again in one game for this gen is asking for way too much.
If I could only choose one city out "Vice City", "Los Santos", "San Fierro" and "Las Venturas", then I would definitley choose "Los Santos", it makes sense.
The GTA franchise are my favourite video games of all time. With past GTAs I would read and look at every preview, but I am trying to avoid it completely this time.