Jason Sussman talked to GamingBolt about Destiny recently - they covered a lot of ground. (There are also a few transcription issues, so if you read something that makes you think "OMG Bungie never told us about ____" you should take it with a grain of salt.) It's a little older (the Beta is mentioned as 'upcoming'), but still has plenty of relevant info. Read it for great tidbits about background research, explorable space, multiplayer count rationale, and more!