IF true, it might just mean that the Isrealis are pretending to be on such a mission in order to get leverage with the US. Brinkmanship, yes, but a lot less worrying than thinking that they are really ready and willing to nuke Iran. You'd have to ask what they'd gain from actually doing so, in any case - can't see what it gets them at this time.
Well it looks to be indicative of Israeli intent. They haven't been shy in coming forward in the past, and like it says in the article, if someone keeps threatening to punch you in the face and then they get out of the chair, what are you supposed to do?
If Israel feels that it is being left out in the cold by its allies, and the Iranian president/mullahs continue with not only their beligerence, but their nuclear/military build up, I fully expect Israel to act pre-emptively. I wouldn't blame them if they did.
If the analogy of the threats of a punch to the face was used with me, I would not wait for the bully to get out of the chair, I'd use a hammer to nail him to it before administering the coupe de grace with a gun to the back of the neck just to be sure.