Details on Bungie's next game leaked

IGN.com received leaked materials about Bungie's upcoming game titled Destiny.
Bungie, most famous for their creation and continued work on the Halo franchise, has since updated their website with concept art from their next release. IGN's leaked materials also included concept art, as well as a synopsis of the game's story, which reads:

"'Our story begins seven hundred years from now in the Last City on Earth, in a Solar System littered with the ruins of man’s Golden Age. A massive, mysterious alien ship hangs overhead like a second Moon. No one knows where it came from or what it’s here for, but only that it’s our protector. Meanwhile, strange, alien monsters creep in from the edge of the universe, determined to take Earth and the Last City. We are young "knights" tasked with defending the remains of humanity, discovering the source of these monsters and – eventually – overcoming it.' Elsewhere in the document, the massive alien ship is referred to as 'the Traveler.'"-IGN.com

The game so far has been advertised as being in development for PS3 and Xbox 360, as well as maybe the PC in the future.
For more concept art and more about the game, check out IGN.com, or check out Bungie's website.