Season three spoilers revealed at Comic-Con and TV Guide

Locke and Desmond survive!
Locke will be reverting back to the boar-hunting mystic he was back in season one.
The first episode of season three will be called "A Tale of Two Cities."
Kate will choose between Jack and Sawyer.
More on Libby's story.

That's it for now. I don't wanna know too much more cuz it'll kill season 3.