Agree Vogs. Top-notch. My hands were clenched the last twenty minutes.
I think that the guy I'm calling Esau (for lack of another name right now) has taken the form of Locke in order to get Ben to murder Jacob. That was the loophole they talked about in the first scene. Esau could not kill Jacob himself, so he had to get a proxy, much as Locke had to get Sawyer to kill his father for him.
Is Juliet dead? I don't know, but I think there's a possibility that she survives, as Desmond did when he turned the failsafe key. I also think that the "they're coming" phrase that Jacob says is not referring to Ilana's group but to the return of the 1977 Losties to the present time.