What's going on in Iran?

Some interesting things could be happening in Iran right now; it's always hard to tell with those malevolent mullahs.  But they seem to be quite angry about ... something:

Iran is rolling out one defiant step after another these days.  In recent days it has begun ten days of naval games in the Straits of Hormuz while warning that it would close those straits to oil shipments if it is attacked.  It has warned Turkey that, if attacked, it will respond by attacking NATO facilities on Turkish soil.  It has announced the successful construction of its first nuclear fuel rod.  It has tested a medium range missile. The recent upsurge in sectarian violence and polarization in Iraq seems to reflect in part Iranian efforts to deepen relations with militant Shiites next door.
Iran also seems to be stepping up its efforts to forge relationships with some Latin American countries whose leaders are not overly fond of the United States. The great A-jad has a four country tour planned this month as Iran looks to build economic and security relationships that might help it evade sanctions.

Close the Strait of Hormuz if attacked? Or merely inconvenienced?
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