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I can't remember all the previews, other than someone lets The Clock run down. I'm betting it comes at the very end of the episode.
"Three, Two, One,..." cut to black.
I'm just glad it's on despite the Olympics.
From my digital cable guide episode description:
[spoiler]Rousseau takes Sayid to a mysterious stranger in the jungle. Is he one of the Others? Meanwhile, Sawyer discovers the Hurley has done something devastating.
[/spoiler]