Alright, here are some of the game conventions and their dates that are coming up in 2013, these are in no particular order:
We got the GDC (Game Developers Conference): March 25-29
http://www.gdconf.com/
Next we have PAX East: March 22-24
http://east.paxsite.com/
Then of course we have E3 2013: June 11-13
http://www.e3expo.com/
Now personally I don't think it will debut at E3, I think June is WAY to late to announce a 2013 game. Also they might not even announce it first at a game conference, they may announce it here on Bungie.net! (I wish). Or on TV, or something. Discuss here, where/when do you think Destiny will be announced?
Also I'm sure there are more, please add them in the comments below and I'll ad them here.
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Expect something on or before February 9, 2013. That is the day when Activision has their conference call, and the last two years they have mentioned Bungie's new game during that time.