debka.com has been reporting this for a long time. I don't know about other people, but it seems to me they're right. Apparently, estimates are that Obama might order it by October as his 'October surprise:'
Khamenei Warns Irans Top Leaders: WAR IN WEEKS
DEBKAfile DEBKA Video August 1, 2012, 8:54 AM (GMT+02:00)
Tags: Ayatollah Ali Khamenei Iran nuclear Israel Video
On July 27, just before Friday prayers, Irans supreme leader Ayatollah Ali Khamenei summoned top Iranian military chiefs for what he called their last war council.
Well be at war within weeks, he told the gathering, debkafiles exclusive Iranian and intelligence sources disclose.
Present were Defense Minister General Ahmad Vahidi, Khameneis military adviser General Yahya Rahim-Safavi, Armed Forces Chief Major General Seyed Hassan Firuzabadi, Revolutionary Guards Corps commander General Mohammad Ali Jafari and Al Qods Brigades chief General Qassem Soleimani. The commanders of the air force, the navy and ground forces were also there.
Each of the participants was tapped to report on the readiness of his branch or sector for shouldering its contingency mission.
While retaliation had been exhaustively drilled in regular military exercises in the past year, Khamenei ordered the biggest fortification project in Irans history to save its nuclear program from even the mightiest of Americas super-weapons. Rocks are being gathered from afar, piled on key nuclear installations, covered with many tons of poured concrete and finally plated with steel.
That same Friday, the US Air force unveiled its new Massive Ordnance Penetrators. Each bunker buster weighs 30 pounds and is able to penetrate 60 feet of reinforced concrete.
Turning to retaliation, the war council endorsed a battery of paybacks for potential US and/or Israeli pre-emptive strikes against its nuclear program. They would start by announcing enhanced uranium enrichment up to 60 percent - that is close to weapons grade.
Oft-tested ballistic missiles, Shehab-3, would be loosed against Israel, Saudi Arabia and American Middle East and Gulf military installations.
Hizballah in Lebanon and Hamas and Jihad Islami in Gaza stand ready to pitch in against Israel with attacks from the north and the southwest.
Saudi oil export terminals would be blown up and mines sown in the Strait of Hormuz to impede the export of one-fifth of the worlds oil.
Khamenei put before his war council a timeline of weeks for the coming conflict September or October.