Not yet, and it might never apply - but to keep tabs on it:
H.R.158 - Visa Waiver Program Improvement Act of 2015 - the bill's current state.
It's passed the house, and has been received by the Senate, but hasn't been voted on there yet.
As many have observed, let alone tourists to the US, it may create two classes of US citizens, for those who have visited Iran.
As a result, it might be ruled unconstitutional, but we'll see. Stranger things have happened.
As a NZ citizen who visited Iran thislast year, I'm also watching it with interest and alarm.