Have you read this week's Ask Ausiello over at EW.com? If you haven't, then click here and read the whole thing now! If you don't mind some spoilers, that is.
Pay special attention to this part:
Question: I have a really fun assignment for you, Aus. Create a chart listing every Lost alum there ever was, and then next to their names, tell us where things stand in terms of them returning for the final season. I just know how much you love to make lists. —Steven
Ausiello: I have a better idea: Let’s scrap the chart and forget we ever had this conversation. In return, I’ll share this Lost nugget with you: I hear Team Darlton will give us the answer to one of Lost’s oldest and most confounding mysteries. And I’m pretty sure it’s an answer none of us expected to get.
Which mystery?! Which one?!
Is it Adam and Eve? Doubt it. Is it the Whispers? Hmmm... Libby? Her place in the mythology is still unclear. We've got no clear background whatsoever. The Numbers? The Smoke Monster? Is it the Ruins (see "The Brig")? Is it the Black Rock? Richard Alpert? The more information about Ricardus, the better! Is it the Hurley Bird? A large bird seemed to call out Hurley's name in both "Exodus, Part 2" and "Live Together, Die Alone" - a.k.a. the Seasons 1 and 2 finale. Is it the Temple? Is it Richard Malkin, as in Claire's psychic? Is it the mysterious painting in Ben's house that looks a lot like Juliet? Is it the cause of the fertility problems?