I don't see much change in his arm slot this year. However if you go back and watch him from 2006 till now the change is pretty striking, he use to turn away from the batter much more and throw from a much lower angle. As he has begun to turn less an less and throw more and more over the top he's continued to lose velocity and lost the snap on his slider. Now luckily he developed an amazing changeup to compensate but now that he's throwing a bp fastball out there the change in speeds will not be as great and his change won't be as good going forward.
He'd best find that extra 3-4 mph on his fastball or we're in trouble.