Something is fishy about this disclosure of a terroist plot and the insistence the US has to be included in the plans. As far as I can tell, there is no evidence of a threat to the US.
With the public already frustrated with this bog in Afghanistan, and tired of the whole Muslim controversy with Ground Zero, do you know how pissed off this nation would be and what pressure would be put on the military to take off all the gloves off and wreak havoc on anyone even slightly suspected? The terrorists are accomplishing their goal of slowly bleeding us -- they don't want to poke a wounded tiger.
I believe it's just a way to include America in some intel gathered about a possible plot to keep the flame going on the War on Terrorism -- that's my guess.