PlayStation and Bungie have a LONG-TERM EXCLUSIVE partnership for Destiny.
What does that mean? It means only PlayStation will be getting exclusive content for Destiny. Most likely early DLC-maps and 60 minutes of exclusive campaign missions. Possible some exclusive character skins and guns as well. Bungie/Activision and PlayStation also have a partnership to advertise Destiny together, as you may have already noticed from the Destiny Commercials. It's also worth noting that Bungie chose to reveal the first gameplay of Destiny at Sony's E3 conference instead of Microsofts.
There is no doubt - The Best version of Bungie's epic new game will be on PS4.
Sony recently gave Bungie this custom-made PS3 at E3. Seems like Sony and Bungie are BFF's now :)
I wouldnt be surprised if there is a PS4/Destiny bundle when the game comes out in 2014.
Here is another imagine from E3's showroom. Bungie showed the control inputs for Destiny on a PS4 controller, and they made no mention of Xbox at all.
....one last thing... Destiny pre-orders on Amazon are selling much better on PS4 than they are on Xbox One. Even Bungie fans are jumping ship to PS4 !