How do you think next series of lost will start?

White light usually means time disruption (Richard did say that everybody in Sun's picture died in 1977 -- maybe he saw the explosion and it appeared to have killed everyone on the site). I think the first episode will begin with a strange scene with people we don't recognize then we'll eventually find out that it's actually Richard's past. We might learn a lot more about Ilana's purpose. We might have to wait a while to find out what happened to Juliet and her group, but the at the end of the episode we might get a clue with a shocking revelation.