I noticed that too. Last year, he threw a very wobbly ball, but has since smoothed it out. His follow through is also different. It looked like he used to chuck the ball and now its a smooth release. He might just have been the victim of bad coaching and needed an better analysis of his mechanics.
I'm holding my breath that last week wasn't a fluke, and that he really has improved. He looks confident, and is actively involved in managing the offense; something Trent was sorely lacking.