Bungie has been pushing their relationship with Sony hardcore. At the PS4 announcement, there was a Destiny video and even at Sony's E3 there was more information and a full length gameplay reveal. They've even said that the PlayStation platforms are going to receive exclusive content.
Don't get me wrong, I think it's great that now more people will be able to enjoy Bungie's creations, but the Xbox fanbase are the people who have supported and loved Bungie's games for over a decade, the one that's bought all of their games and merchandise. I don't understand why they being so cold to Xbox and it's fanbase?
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I'm going to go with it's because Bungie hasn't released a PlayStation game, and this is a good way to show what they have to those guys. Everyone on Xbox knows what Bungie is capable of, but not so much from the Playstation people. I am getting Destiny on the X1, but I will probably get the PS4 sometime later on (not going to buy two of the same game though).