I've been thinking this for some time, what if the PSN are just the Lab Rats for Bungie? And the reason why they do is for the Xbox's users to get their later version first so we don't find as much error in their game as the PSN with their first games as our first game, as DeeJ says, with the controller in our hands.
I know it might sound stupid, but maybe there's a bright side.
Now... If you want a 90% chance of heartbreak (xbox users) click the link. [spoiler] The other side is in the link [/spoiler]
By the way, microsoft babies, suck it up.
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It is because of Activision. This was their call. The determine the publication schedule, and PlayStation probably paid to have "special" considerations. Very few, if any, studios decide this part of their game.