I think it'd be more accurate to say that Bungie made a game and Sony paid Activision extra money to make extra content for their system. And I don't know if it's true but people say Bungie helped design the PS4. What is true is that everyone working on the game had been testing on PS4 at home I believe and I guess you could say the game is native to PS4. Besides. Seeing as how PS4 has millions of more units in people's homes then xbox by a factor of 2 it makes a lot more financial sense to try and get as many of those playstation owners to buy this game.