They already have it, I would guess.
They just want to wait to use it until their special day.
I believe they will hit tel aviv. or maybe Haifa, hizbowla just sent out word to muzlims to get out of haifa, could be they want to nuke haifa.
Actually, my suspicion is that they don't have it, but that Ahmadinejad ACTUALLY BELIEVES that the Twelfth Imam will reappear on that day, and/or that the world will end.
He'll probably be very disappointed and confused on Aug. 23.