Ok guys after expending a good few hours reading and thinking about it here are some possibilities. Scout what do you think?

Remember the drawing that Locke draw, 5 hatches all around and a question mark in the middle. It means that there is one more hatch we havent seen yet and maybe there is where the others live, eat, sleep, write, will bring Kate, Jack and Sawyer. Here are the first 4
1. Where Locke, Eko and Desmond are
2. Where Anna Lucia, Libby, Eko and the other 3 where staying before they found the other group
3. Where they took the expecting mom (I forgot her name). Later she found the place herself
4. The place that Locke and Eko found, where they watched the other video and found out about the notes.

So what is in the question mark, maybe there is where they will find all the answers, computers, people, notes, and the real person in charge and all of this is, of course underground (here is where locke was being pulled into a hole by the black smoke.) Someone said that the hatch on the beach was a hatch from another place besides the swan-place, this could be it.

For sure coming back next season: Locke (to obvious why), Desmond (to obvious why), Walt is one of the most important characters of the story, especially with his abnormal capabilities. Appearing few places in few occasions, the polar bear (note singular - there was only ever one). if you go back and watch that episode, you see that Walt is reading a comic book with polar bears in it.
again in Walts flashback when the bird slams into a window (at his stepfathers place) - he was reading something on birds at that point.
Walt cannot leave the show.

Now something that nobody has talked about. Hugo got Lotto numbers from freaky guy repeating the numbers over and over and over. I bet this guys was in the island before and made back to civilization, same numbers and lost his mind, I wonder why? He might even be the guy that was there before Desmond.

Are there any others inside the group of the losties?
I am the only one that wonders how has Charlie is being able to survive and still be alive, okay this is what I think:
Charlie was with Claire (pregnant girl) when she was taking by Ethan
He never told anybody what happen, he was in silents for a long time.
He was hanging from a tree from his neck, but was still alive
He supposedly is the one that shot Ethan
On the 5/17 episode he gave some Dharma shots for the baby, he said he found them where? He said, he used it himself, he sure knew a lot about it.
Way back in one of the first episodes, he dated a girl (brown hair) Her dad had a lot of money and power and he offer Charlie a job, which he didnt take, did he?
He wasnt taking along with kate and the other guys, because he is a nice guy or because HE IS ONE OF the others? If you agree with me in any of this thoughts, please let me know if I am forgetting any more clues.

Now I am not sure about this one but I still have my doubts.
Libby is part of the experiment. Gave the boat to Desmond, Was at the same place with Harley (hugo), They didnt show as much about her. She was holding a thick blanket when she was shot. So we didnt see her get shot, just looks like it. She was a nurse, psychiatric doctor, a scientist?
If when sawyer shot at the guy with the fake beard, the bullet bounced off him episode 5/17, it means that the bullets are fake and Libby is not dead, and maybe just maybe Anna Lucia is not dead neither. Charlie could have change the bullets long time ago and they have the fake ones all this time, Remember when Michael try to shot the big bird and the bullet was fake? So maybe Ethan and Libby are still alive. Now I know what are you thinking what about Jack, would he know if somebody is not dead. Could he, is he on it too?

Thats anybody else has any more seat numbers, other than these ones?
Anna Lucias seat was 42f,
Jack seat was 23A
Roses seat was 23D
Bernards seat was 23E

Author: Tricia