For the second day of Bungie Week festivities, Bungie has posted the Official Destiny Gameplay Reveal video to their YouTube page in all of it's HD glory. Also, be sure to check out the news post on Bungie.net.
The bumper at the end of the video also teases a "Building E3 Reveal" video, with a placeholder that says "Coming Soon". Hmm, I wonder what that's about... (Thanks, SigbiasSilva).