The first concept art for Uncharted 4: A Thief's End has been revealed, showing the kind of environments players can expect to find in the game. This concept art is featured in Naughty Dog and Dark Horse's book, The Art of Naughty Dog.
As can be seen in the images below, one of the places that Nathan Drake will visit in his next adventure is a flooded city. One of the images also hints the possibility of underwater exploration.
Fans also pointed out that the concept art featured in the image where Drake is standing on a inflatable boat is very similar to a section in Uncharted: Drake's Fortune. Although this might just be a coincidence, it could be that one the many places that Nathan Drake will visit in this adventure is the island from the first game.
Uncharted 4: A Thief's End launches for PS4 in 2015.