Obama gave an extensive interview to The Atlantic, published today and dealing with Iran:

He talks about Arab spring countries as if they are dominoes.

It is our estimation that [Syrian President Bashar al-Assad's] days are numbered. It’s a matter not of if, but when … If that happens, that will be a profound loss for Iran.

In visits with Israeli PM Netanyahu next week, Obama sounded clear that he doesn’t want Israel to unilaterally attack:

Do we want a distraction in which suddenly Iran can portray itself as a victim, and deflect attention from what has to be the core issue, which is their potential pursuit of nuclear weapons?

For what it’s worth, InTrade is pricing in a 36% chance of an airstrike against Iran by the end of the year, down from over 60% in mid-February.