Is the U.S. Planning to Strike Iran Soon?

Der Spiegel reports that "recent reports in the German media suggest that the United States may be preparing its allies for an imminent military strike against facilities that are part of Iran's suspected clandestine nuclear weapons program." It's hard to think of a greater strategic disaster for the U.S. than a nuclear Iran led by the most reactionary elements there. It's also hard to think of a greater strategic disaster for the new government of Iraq, for Saudi Arabia, or for Israel--and Turkey can't be very excited, either--so assumedly the U.S. is getting lots of intelligence help.