This is from my favorite site, io9 - the link below.
Lost:What happens to Sun and Jin in season five? "My character's been isolated," says Yunjin Kim. "And she's scheming up all kinds of things. You get to see a new side of Sun." Also, there's tons of action in season five, says Daniel Dae Kim. And there are a lot of timelines going on at once. [EW via Doc Arzt]