Bungie just updated their site with a snazzy new look, and as part of the update they've added their 7 core values (not to be confused with their plan for world domination) on their career page. They are:
If you want to see the description for each value go check out their career page (the link to the core values is a little more than half way down). Thanks to Chris Alejo on Twitter (Technical Writer at Bungie) for pointing it out!