It should be fair to say that since they elected a much more progressive and less hostile President than the last one, they have considerably scaled back on the aggressive rhetoric.
The U.S should be sending feelers out to Iran, because frankly I have more trust in them they I do countries supposedly Allied to us (Saudi Arabia, Pakistan, and Israel) all of which claim to be our friend and then go and stab us in the back. At least Iran is honest to say they don't like us, that's at least a start in my book.
Lastly Shiia Muslims have been persecuted by Sunni extremists for 800 years, to say that they have vested interest in keeping ISIS in check is an understatement.