In LOST Panel Part 3 there is the question about Juliet:
Male fan: I just want you to know that I cried like a sissy when Juliet fell and if there is any guy in here that would tell you differently, they’re lying to you, I promise! So I need to know if she is ok. And if she is not, can you make her ok? Damon: Well again, I think this all returns to the idea of whether or not her detonating the bomb had the desired effect. I mean if it did, my guess is that she will be ok and if it didn’t work then probably prognosis is not so great, considering the fall. But I think we can say here that Elizabeth Mitchell will be in LOST in the final season. Carlton: Yes!