Bungie will be in attendance at the 2013 Game Developer's Conference in late-March, with an event schedule hinting at Destiny talk in a panel entitled Brave New World: New Bungie IP. Destiny, of course, is the not-quite-officially-revealed post-Halo/post-Microsoft Bungie project that Activision will publish.
For a game that hasn't technically been confirmed or "revealed," we actually know a lot about it through rumors, leaks, and the occasional Bungie tease. The biggest infodump came in late November 2012 when leaked materials that Bungie confirmed to be accurate offered some initial hints about the story and setting.
The GDC panel will focus largely on Bungie's process and how the team brings a world together "from concept to production." The description also promises a "glimpse" of what's coming next "where the next ten years of great Bungie adventures will unfold."