Not original, I suppose, but it's a good place to start (
if you read this article on BuddyTV yesterday, then you got a spoiler, but this prediction is more about the how and why than the what). If Jin really were dead, we would have seen a body, or some sort of postmortem memorial from Damon Lindelof or Carlton Cuse, as they did with Michael. I expect the beginning of season 5 to show us an unconscious Jin picked up by Faraday in his boat right before the island (and it's surrounding waters) to disappear. Jin will become a major player in the last two seasons, especially with Sun. The drama that can be wrung from this situation (Jin is alive, but Sun thinks he's dead) is exceptional, and one that will inform the circumstances in which Sun finally comes back to the island.
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