Or they probably just didn't give a definitive answer on whether it's releasing for the PS4 because they're just unsure. Maybe they want to see how well these consoles sell out the gates to get an idea if it would be a good decision, financially, to make an upgraded GTA V for said system. I believe it was Dan Houser who once said, "If there is a market for it, we'll make it." It's hard for Rockstar to make an early commitment because of how much money is at stake.