Read through this for proof (sort of...) that the image in question is in-game.
http://www.gamesas.com/index.php?/topic/1158209-game-informer-owes-us-two-more-screenshots/page__st__40
From the article: "Finally, press down on the menu, and it's as if your character is looking down to the ground. As he looks earthward, the first person view begins to pan far back. Skyrim's map appears as a huge topographical display viewed from an improbably height. You can explore the map at your leisure, passing the towering mountain peaks, forests, cities, and tundra."