Hillary lets slip that Obama administration has contingency plans in event Iran acquires bomb, ie bolstering defense profiles of mideast states, US nuclear umbrella etc etc - she said this as if intended to dissuade Iran from pursuing nukes, the idea being I suppose that Iran will be less secure not more if it goes nuclear - but Israel interpreting this as evidence that Obama has already accepted inevitability of Iran going nuclear, something which I have thought very possible given moves US has made. If Hillary misspoke, said something she shouldn't have, then that would seem to confirm Israels fears - but if she meant to say it the only reason for doing that would be because Obama admin thinks it a viable negotiating ploy, thinks Iran amenable to ostensibly logical counter arguments - but of course Iranian leaders are moved by a logic of their own which they no doubt see as inviolable and to imagine that exogenous claims against it stand much of a chance of success is pretty thin soup.
So, what i think you're left with is: Hillary misspoke and said something she shouldn't have, possibly revealing Obama admins true POV re Iranian crisis; or she said something she meant to say but for fairly dubious reasons and therefore was ill advised to say it since it achieves nothing other than undermining the Israeli position while boosting the Iranian.
Is it their goal to undermine the Israeli position? Certainly possible if their ultimate goal is to avoid confrontation with Iran and learn to live with it going nuclear. I'm guessing Netanyahu is becoming increasingly disturbed by what he sees coming from Obama.