I don't remember if I've either read a synopsis of the Art of War or excerpts from it, but I remember it being mostly about his usual thoughts on the military: shitting on mercenaries and insisting on standing armies.
Also, I think it's appropriate to suggest to someone who's out to read Clausewitz to at least familiarize himself with the Revolutionary and Napoleonic Wars. It seems, to me at least, as if the whole point of "total war" was that the French kept fucking coming back from the dead.