Nowgamer published an interview with Harold Ryan, president of Bungie, about next generation technology, MMOs and crafting the world of Destiny. There is a particularly interesting statement about giving players a sense of influence and impact in a shared world.
There will be a huge set of discussions to have about the activities you can engage in in Destiny. The designers have the ability to make something an activity that you play through, and they control the frequency that you can play through it, whether you play through it once or multiple times, and they control whether you play it with two or three friends or whether you play it in a public space, where you might encounter it every time you land on Venus as you go through.Go read! (Thanks, Xenos.)