There's a lot of will-he-or-won't-he going on in terms of whether or not the U.S. and/or the world is being prepared to attack Iran. Here's two extremes ...
Why Bush won't attack Iran describes some of the inner dance going around the Administration -- and describes that Condoleeza Rice's job is to develop a third alternative between the bomb-or-do-not-bomb-Iran pair of options. Rather, that's what she has been doing, but the time has run out.
The article references a report by Joe Klein of a December 2006 meeting where they deeply discussed the possibility of successfully attacking Iran. The results showed it being very unsuccessful and that led them to begin covert actions to attempt destabilization Iran. Given the U.S. track record of destablizing countries I suppose we could expect a coup or revolt in Iran sooner or later.
On the other hand Bush setting America up for war with Iran describes how the Pentagon has drawn up lists of 2000+ targets in Iran and is making war plans.
Hmm... who to believe???