Probably. This rumor has been going around for 4-5 years. I recall an article in Israel about a USAF officer saying a contingency plan for shooting down Israeli aircraft that over-flew Iraq existed in much more credible sources.
Of course, military people make contingency plans for everything. There are plans to combat alien invasions, for example.
Obama is unbelievably hostile to Israel. His first act as president was to call Hamas (a terrorist group, even according to Egypt).
He has scuttled long-planned military cooperation.
His adviser, Samantha Powers, advocated the invasion of Israel to assist Hamas.
Valarie Jarrett was born in Iran, speaks Persian, and I believe her parents still live there.
There is a long history of black antisemitism among blacks in the USA, and Obama went to (and was a leader in) a "church" that specifically preached the destruction of Israel for 10+ years.
Obama is also unbelievably thin-skinned and hostile to anyone who does not think he is the smartest guy in the whole world. So Israel disagreeing with his approach with Iran undoubtedly throws him into a rage.
Obama went into a temper-tantrum when Bibi did not act like the plantation Jews of the DNC and dares come to speak to Congress, no doubt in disagreement with Obama's plan.
And Obama has turned Iraq into such a clusterfuck that the USA needs Iranian ground troops. So they are seeking to curry favor.
So, in short, this is a plausible story. I would hope there would be a revolt in the USAF and they would refuse the order, but soldiers follow orders. So probably it would be a fight.
All that said, I 100% doubt the reaction of Israel would be to push ahead with a limited strike on Iran and come into military conflict with the USA, let alone Israel having to nuke the USA in response (which, yes, we could do). Just not going to happen.
What would happen, and probably will happen if the USA interferes with a conventional strike, is Israel will be forced to use nuclear weapons on Iran in a preemptive strike. These could not be intercepted by the USA and would resolve the problem once and for all.
And Israel has no other choice. We've been backed into a corner.
I give the chances of a nuke strike at greater than 50%.