Crowley thinks it's all for show:
The big question now: How long is Obama willing to give the Iranians to demonstrate a good-faith negotiating posture before he starts turning the sanctions screws on them? I think we're probably still a few months and some complex maneuvering away. Even if Obama is skeptical about the prospects for talks (and I suspect he is), his team believes it's critical that the international community perceive the US to have made a good-faith negotiating effort of its own. Even if Khameinei and Ahmadinejad are giving America the finger, an important kabuki dance remains.
And who will really be running Iran this fall, with what limitations, is still being negotiated. A little benign neglect right now is what is needed.