Matthew (Jack) Lost has told E! Online that he is the only cast member to know what that crazy smoke monster is and how the show ends: "I think it is going to be very satisfying and cathartic and redemptive and beautiful. I've talked to Damon pretty extensively and every time I talk to him it's sort of surprising how moving it is just to talk about it."
He also reveals how season six will kick off: "It's very surprising and probably fairly confusing initially to the audience… Like a third of the way in [to the season] I would guess we are going to [settle] in one time frame and it will be very linear—no more flashbacks, nothing. It will be on the island and sort of a final conflict to the end," says Fox.