That is rated as a moderate probability. You can see this by changing the "Likelihood to occur in 2014" filter on the left. The colours of the markers represent the "Preventive Priority Level" which, as the notes below the map explain, is a combination of likelihood with impact on US interests. The latter is not an impartial measure of impact on the world, but takes into account only whatever the people behind this consider to be "US interests". Not even all Americans would be likely to agree on that.
That would be the Council on Foreign Relations.whatever the people behind this
Thanks for the correction. I was glancing over it, I'll be making a much more detailed examination of the site when I'm not on a 4 inch touchscreen. I still however think it's a sad sign of the times that we've pissed off so many people that there's a statistically significant chance of some foreign, non governmental agent committing such an act.