It's hard to tell about these types of leaks -- it could be an unauthorized leak, or a deliberate one ( I.e. not really a "leak") to be a warning to Iran that we are ready, willing and able to do what it takes to stop them from building the bomb (if they haven't already done so, which isn't certain).
THIS is really high stakes poker, except that the US is not bluffing.
That is what my husband thinks it is: Fair Warning.