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Many publications saw a 90 minute gameplay of GTA V and then reviewed it.
gtav.net wrote in brief about the map and other features.

Map features

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Similar to previous GTAs, the map isn't landlocked (surrounded by water).
The map 3.5 times the size of Red Dead Redemption in terms of playable area above ground. Five times if you count underwater area.
The geographical scope is huge and spans:
Mountains
Rivers
Lakes
Military bases
Farmland
Desert
Dense urban environments...and more
An underwater ecosystem exits, "the sea is teaming with fish and sharks"
A deer and a wildcat were spotted in the mountains.
Treasures can be found underwater, but NPCs will be looking for them too
Shipwrecks, sharks, hidden treasures and more could be found underwater
The entire world is populated with fitting wildlife and inhabitants unique to specific areas

These features are CONFIRMED.