Sawyer isn't dead. Remember when Kate was talking on the phone with him in the flashforward with her and Jack? He's still alive, as to where he is is unknown.
I also think that Desmond, Jin, and Michael are all going to die. Maybe not Desmond, he still has a story arc to finish off, but probably Jin and Michael.
Juliet and Ronard (loooool) are probably not going to die, but I woudln't be completely suprised if they did kill them off. Hurley was surrounded by a LOT of graves in the season preview commercials.
I think Claire is dead already.