The Director of Uncharted 4, Bruce Straley, has said that Uncharted won't be running at 60 if it somehow affects the players experience. He stated this in the latest issue of Edge.
The demo for Uncharted 4 last year, ran at 30 frames per second. He does mention the game can run higher than that.
"We're actually above 30, but we locked it [for the demo], Straley said. "We're going to do whatever it takes to make the game we want to make. If it means we could go for 60 but lose something that would really impact the player's experience, then it's our choice as developers to say, 'Well, we're going to go for the experience over the 60 frames.'"
Uncharted 4 is one of the most anticipated games this year, stay tuned for more news on Uncharted 4: A Thief's End