The NY Post is running an article that briefly describes where LOST left things at the end of last season.
It also mentions two spoilers, so if you haven’t seen this yet, and don’t want to don’t read any further!
Mr. Eko (Adewale Akinnuoye-Agbaje) will have a flashback in episode five.
Libby (Cindy Watros) will return in a Hurley flashback.
Boone (Ian Somerhalder) will be back in some way, helping out Locke.