This really does look brilliant.
An article on it with more pictures is at Yanko Design.
"You take this “Turtle Wrench,” right, and you attach it to your wheel: it connects to all of your wheel bolts at once. Now the wrench has four arms sticking out, one of them each a wrench that correlates with a bolt. You drive forward one full rotation, and as you push forward each wrench, it loosens a bolt."