He's shown it before though. It is a good thing but it's not really new. Remember the first off season he had with Palmer? They worked on his short to intermediate game and he came in that season doing very well with it. The next season they worked on his deep ball stuff and did well with that.
I'm not worried about big throws. In fact, I am not worried about Josh at all. I thought the entire week after the Jets game was overblown. Yes, he deserved the criticism for the loss, but some people were just crazy with the "Josh is Wentz" type of stuff. All QBs have bad games. Josh is just magnified when he does.