[url=http://www.bungie.net/News/Blog.aspx?mode=news#cid32192]Let's open the Sack[/url].
As for the challenge, guessing at Bungie Lore won't be enough. We want to see your problem solving mojo. Team up if you will, but a winner is just a guesser without documentation of how they solved the puzzle.
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So each picture corresponds to a number, and if you draw a line from each picture to its corresponding number the lines will cross out letters leaving you with the letters to spell "Per Audacia Ad Astrata".