At E3 2013, Bungie showed off brand new Destiny gameplay and trailer videos. The videos were packed with previously unknown information and confirmations, new weapons and enemies, and showed off several features which, before E3, had only been described and speculated on.
Videos
Destiny Gameplay - E3 2013 HD PS4
Destiny Gameplay Demo E3 2013
Official Destiny E3 Gameplay Trailer
Destiny E3 Official Trailer
Destiny Behind Closed Doors Demo - E3 2013