There are no farm areas near Miami (Vice City) in the map even though South-west Florida is a huge agricultural center.There are no port areas ( Dodge Island is absent, no boats docked anywhere, no piers.This airport looks more like one you would find in Africa or South America. Airports in the U.S use buffer zones between the runways and other zones for noise and security reasons, which are simulated in every GTA game.
The airport does not have highway access which every airport in the HD-era has, which is just very unrealistic.There are seemingly no low-rise buildings even though Miami is primarily a suburbanized urban area.
Every GTA-map in the HD era contains a urban expressway network, this one doesnt.
It appears Rockstar is going to be completely silent regarding the game until they make a proper announcement sometime down the line. With GTA 5 being ported over to another console, we have yet to hear any news from Rockstar on the release of GTA 6. It feels like an eternity has passed since GTA 5 was released all the way back in 2013, the game is now set to release on the PS5 which will be its third iteration on a Sony console.