Before he was DBO-fied, Xenos let us know that Joystiq posted a little interchange with Bungie's Jonty Barnes, Director of Production, mostly concerning the first Destiny expansion, The Dark Below. There's also a few other details about the Beta, and how Bungie will keep upgrading and growing Destiny consistently as opposed to just releasing it, a few DLC, and moving onto the next project.
We're going to change the game after launch in a frequency that we think makes sense, and that isn't going to be dependent on The Dark Below."