Definitely not disappointed about it going back to Vice City, the world looks great and, ultimately, it's going to be a totally different beast to the PS2 Vice City (was going to say OG Vice City, but that would be the top down one!)
I'm wondering what they can do with the world (other then missions obviously) to make it interactive/worth your time though? Just thinking about the previous Vice City where the beach was a big part of the map, but ultimately absolutely pointless.
Maybe it all just has to be mission-centric/focused - like I can't imagine why you'd go to a nightclub in the game otherwise? Either that or there's just an insane amount of mini-games/random events etc.