We know that the Chinese Communist Party has carefully studied the collapse of other authoritarian regimes and one-party systems, exhaustively examining transition experiences from Mexico to Poland in order to draw lessons for the protection of its own power. There is little evidence that Iran's ruling clergy has done anything comparable -- and it's easy to imagine why they won't.
As for Rowhani, let's expect him to make a few modest gestures in the direction of reform. But it will be a big surprise if he manages to go beyond that. He knows that it will be his own neck on the line if he steps out too far.