Alireza Avaee has been appointed as the new head of Tehran judiciary department. He replaces the long serving mullah, Abbas Ali Alizadeh. It is said that Mortazavi, the notorious chief prosecutor will too be removed of his job soon. Changes are also taking place in the military positions.
Some have related these recent moves to the current nuclear crisis. It may well be so. However, it may also have to do with the upcoming visit by the UN rapporteur (which has not yet been officially confirmed, but the regime has been informed of its likelihood). The regime wants to get the torturers away from the scence. It is already in lots of trouble internationally and doesn't want to invite more.