Ausiello with EW provided us with a little casting update, confirming that Brad Henke will be joining the cast and is connected to Ilana.
Brad Henke on IMDB
Here is complete post:
Question: I'm borderline crazy addicted to Lost, and would very much [twitch] appreciate a scoop on any recent news [twitch]! -- CJ
Ausiello: Listen up, Crazy: In last week's AA, I told you that Team Darlton had been quietly searching for a "younger Phillip Seymour Hoffman-type" for a multi-episode arc this season. Well, in this week's AA, I'm telling you who they got: October Road's Brad Henke. I can't say much about his character, except that he has ties to the mysterious Ilana.