Once products are out in the wild, that's when Bungie will really learn what works and what doesn't. People wonder what the hell Bungie have been doing for the last four to six years that have resulted in such a "content-lite" game, but I think they've been busy crafting the tools necessary to create and maintain the univesre. Basically, the hard part is done. Now it's all about fine-tuning and tweaking.
/eventlog