Well once thing is absolutely certain... IF indeed Iran is working towards the 'option' of nuclear weapons, Israel is doing everything in its power to help it "decide" to take that option! The nuclear option is one of deterrance...and conventionally, Iran has very little deterrant capabilities against an attack that Israel keeps threatening. Israel's threats are almost certainly pushing the envelope already; an actual attack will clinch the deal!
U.S. says it killed 10 AQAP Islamist militants in four air strikes in Yemen since April 23 (Reuters)
from the article: Iran military head warns of 'heavy damage' should Israel attack