I'm bemused also. I'm not being funny but how are people making sense of it all if they think it was Jin's flashforward? They must be mighty confused.
I'm quite convinced that he is dead. I've seen loads of people doubt it, but the emotions and actions of Sun (and Hurley) seemed genuine. And much as it saddened me to learn of his death, if the writers do a turn around there it'll be shoddy. I won't be impressed.