Ars Technica not sold on Destiny... yet.

by Sg , East Coast, USA, Tuesday, February 19, 2013, 11:53 (4298 days ago) @ narcogen

This is why I don't buy those who say this reveal was all pre-planned. I think it's a response to the leaks, at least in part, or perhaps Activision is getting cold feet and wants there to be more hype.

I think this is the most likely explanation. The game isn't complete enough to show content worthy of a video game announcement, but leaks put Bungie (via Activision) in a tough spot.

I'm guessing that the vidoc was a compromise of Bungie not being ready to announce the game quite yet, and Activision wanting an announcement in response to the leaks.