The main change is bigger airport (hangars added?) and the west coast actually have some sand right now but beach in Los Santos was bigger which is sad
EDIT: and there was another closed street in Middle Park
Also notice the 'cut street' in the Paleto Bay, and an extra highway.
Notice how there was no dam and there was a lot less water.
They cut a lot, but they added a lot more.
I'm really interested into seeing the actual beta map. It's very interesting to take a look at the early concept of a game.