How do you think GTA IV Episodes got exclusive on 360, not because a choice Rockstar made its because Microsoft payed a sh!tload of money for it.
So its up to sony if they want to infest a certain amount of money to keep it exclusive (as with FF versus XII) wich i think they will
I think Sony is gonna try and keep it as an exclusive since it will make allot of people to buy a PS3. Thats why they went for Final Fantasy Versus XIII as an exclusive (made by the KH team:D) since it seems its more hardcore Final Fantasy then FFXIII wich will make more people buy a PS3.
And who knows when the time comes sony made a price cut and much more people got one by then