He does allot of things with devs, but he is also responsible for signing them to playstation platforms (I would assume that includes exclusivity terms).
However I would not just think Sony is going to try and lock it down, I could see Sony giving them options. They could offer them full exclusivity and all of the rescources that come with that, or they could go pub fund and it would be timed exclusive to PS4, or they could just offer them support for "first on console" rights.
Its gotta be tempting for a team like Hello to really consider an offer from a pub like Sony as they dont dictate what the developers do with the game, and they have a ton of resources that a kickstarter would not garuntee.
My first guess is that it will be PS4/PC first, then maybe Xbone later.