I actually posted an article about that earlier in the week. Tebow was having rotator cuff pain and, for the sake of his long-term productivity, they changed his motion. Took him into the lab, pasted sensors on him, and videoed it. Came up with the change.
It is a bit disconcerting. He claims he's doing fine with it and it has worked with the pain. But the kid threw in high school for 10,000 yards doing it the old way and I just have to wonder whether the change is actually going to stick and whether it isn't going to feel a bit unnatural to him, make him hesitant.