I already talked Eslatele a few days ago that the "idea" was commenting more about the plot of the sixth season of "Lost", which we must not forget that be the last, was that we see from the beginning 2010, as the ABC series returned some of the characters who had disappeared in previous seasons.

promotional image which shows all the characters even the dead. Locke also appears in the center back.
Said and done, it seems that the series intends to return to their "sources" (which usually occurs when they are many seasons at the back) and so announced at the last San Diego Comic Con (which certainly seems that for next year could well move to Los Angeles), where they were also Jorge Garcia, Nestor Carbonell and Michael Emerson, the producers Damon Lindelof and Carlton Cuse and that people understand what will happen ...
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Cuse and Lindelof said many things as we used to always talk with second, this time made clear details that were partially anticipated but finally confirmed, and we are going to see how Juliet and reappear Faraday is ie they should be dead but since everything is repeated from the beginning then see them again.
Also responsible for "Lost" talked about that apparently travel through time and the "flash-forwards" were only eliminated in the sixth season and just as these "storylines" have impacted both the spectators and fans of the series, for the new season are expected to be much more surprising.

As for the return of other characters, because names were not fixed and as for other things or "mysteries" I must say that it seems no more to see the Dharma Initiative and on the other hand we know that Jacob is not going to reincarnated as anyone else.
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The Comic Con gave to much of what the panel of "Lost" is concerned, although the fans surely would miss which saw some promo about what lies ahead. As they had nothing to offer in this regard as it was seen was a series of videos that made by fans or by the chain itself, were based more on mood than anything else.
Thus we see parodies as would happen if the movie "Brokeback Mountain" was starring Jack Hurley and Sawyer or her own restaurant fried chicken:
Via | TV Guide