Getting Lost: Series Finale Talk, Thoughts on "They" & More

Will Lost end with the gang going back to happier, pre-island times?
Featured here in the latest installment of TVGuide.com's Getting Lost video series:
• I start off with a reminder about some Very good news (with a capital V).
• Leaping ahead in time a bit — as a Lostie is prone to do — I had to wonder: Are the producers locked into what the series' final scene will be, when Lost signs off in May 2010? Carlton Cuse gives me an update.
• Who is the "they" Jacob warned Un-Locke about? I share your top two theories.
• Similarly, this week's Burning Question tackles another case of uncertain identity. Give it a listen, then send your best theory to Getting_Lost@tvguide.com.