Really, he's looked pretty crappy to be honest. Aside from the surface helping his slice serve, there really isn't any change in his play. He just slices and loops from the baseline waiting for errors and then intentionally drops the ball short and then tries to make a quick pass.
Hopefully after a couple more wins and the confidence grows he'll be willing to take a few more risks. Don't get your hopes up.
Well, that is the way he plays, for a long time now. I don't think there is a reason to think he will change.