I don't really play a lot of video games, but I came across the Concept Art pieces for the upcoming NCsoft game Guild Wars 2 today and I was blown away. I played the original years ago, and this looks like a huge step up conceptually and seems to have a much larger scope.
The accuracy from the concepts to the in-game is also really impressive. Here is the translation into 3D from the shot above.
There are more concept pieces on the game's official site, here:
GUILD WARS 2 - CONCEPT ART