Iran's Weapons of Mass Destruction
It's from the same group you cited. Quote:
Iran seems to be trying to develop a “bomb in a fog”—to keep its efforts both covert and confusing enough that there will be no conclusive evidence that will catalyze the UN into cohesive, meaningful action or justify a U.S. response.
That pretty much sums it up.
About all that can be said with certainty is that Iran has made a big deal about August 22nd, and has been dropping apocalyptic hints.