During Bungie's GDC panel earlier today, which was all about world-building, was this bucketload full of concept art, most of it unseen until today.
Update - Here's some video from the event as well, an animation showing off how characters went from the drawing board to the game.
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The images you'll see cover all aspects of the game's pre-production, from designing worlds to characters to enemies to individual locations.
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Some of it has been cut, some of it will look different when the game is actually released. But all of it looks absolutely fantastic.
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To see the images at full-size, click the "expand" icon in the bottom-right of each one.