"Former Secretary of State Henry A. Kissinger, who regularly advises President Bush on Iraq, said today that a full military victory was no longer possible there. He thus joined a growing number of leading conservatives openly challenging the administration’s conduct of the war and positive forecasts for it. " NY Times
I would say that this is a real turning point. Kissinger has been advising Bush privately and for him to say this in the open is some sort of signal. Whether or not his "pupil" will accept the signal remains to be seen.