Mousavi spoke out against the regime "more strongly than ever before" yesterday:
“How can it be that the leaders of our country do not cry out and shed tears about these tragedies?” Mr. Moussavi said, in comments to a teachers’ association that were posted on his Web site. “Can they not see it, feel it? These things are blackening our country, blackening all our hearts. If we remain silent, it will destroy us all and take us to hell.”
As the NYT notes, Thursday will be a big day for the protest movement:
That day has great symbolic importance, because it is 40 days after the shooting of Neda Agha-Soltan, the young woman whose death ignited widespread outrage in Iran and beyond. Commemorating the 40th day after a person’s death is an important mourning ritual in Shiite Islam; similar anniversaries for dead protesters were essential in the demonstrations that led to the Islamic Revolution in 1979.
This is not over. It is just beginning.