"Glass Ballerina" Commentary and "Further Instructions" Spoilers
In The Glass Ballerina, Ben remarks to Juliet, "You never made soup for me" after Juliet brings soup to Jack. This seems to be further evidence of a past relationship between Ben and Juliet.
The scene in which Ben hears that Sayid has a sailboat is rather interesting. Colleen, a new Other, says to Ben that an Other named Ryan saw Sayid find the "decoy village," and Ben says that that's what they wanted. Colleen says that Ryan followed Sayid and saw him with the boat. Ben is obviously distressed, but Juliet brushes it off, saying, "Sailing in circles will keep them busy." Colleen retorts, "they could find us," which is strange because as we saw in the season premiere, The Others' village is inland on the island. Maybe Colleen meant that the Flight 815 survivors could find another of The Others' bases, perhaps on a nearby island. After all, we learned from the Pearl Station's Orientation video that the Pala Ferry leads to "the barracks." Ben's surprise at hearing that Sayid has a boat indicates that The Others probably didn't know that Kelvin had repaired Desmond's boat. This seems a bit odd since it had been anchored in one of the island's coves for three years. However, if this theory is correct, then it seems to confirm that Desmond's hatchmate Kelvin was not working with The Others, contrary to some fans' speculations.
We now know that Sun has been in bed with Jae Lee, making Jae a possible candidate for being the father of Sun's baby. However, based on when Sun's morning sickness began and other factors, it is still likely that she became pregnant on the island and that the baby is Jin's. (Refer to Lostpedia's correlation of possible dates and pregnancy facts.)
We find out that Karl is a friend of Alex through Alex's candid conversation with Kate. On The Official LOST Podcast, executive producer Damon Lindelof revealed that Karl "is legitimately an Other who is legitimately trying to escape and has legitimately been beaten up, but the reasons why are yet to be discovered... I would say that you'll have a very good idea about who Karl is and why he was caged by the end of the sixth episode." Another revelation from The Official LOST Podcast was that "there are other Others in other places [than the Hydra Station]."
Later, as The Others board the boat and Sun finds herself trapped, Colleen and Sun meet and Sun threatens to shoot Colleen if she approaches. Colleen says "I know you, Sun-Hwa Kwon. And I know you're not a killer. But despite what you may think, I'm not the enemy. We are not the enemy. But if you shoot me, that's exactly what we'll become." Sun shoots Colleen, but we do not see her die.
Ben tells Jack, "I want you to change your a—perspective." He then reveals to Jack that his full name is Benjamin Linus and that he has lived on the island all his life. Ben then tells Jack, "If you cooperate, we send you home." Jack asks, "If you could leave this island, why would you still be here?" to which Ben replies mystically, "Yes, Jack, why would we be here?"—implying once again that The Others think they're "the good guys" and have some special purpose to fulfill. Jack is then shown the Red Sox winning the World Series, which leaves him awestruck (and proves beyond the shadow of a doubt—in my opinion, anyway—that The Others have very good connections with the outside world), and Ben tells Jack, "If you listen to me, if you trust me, if you do what I tell you, when the time comes, I'll take you there. I will take you home." It has been rumored that The Others would try to convert one of the Flight 815 survivors, and now we know that they want Jack to do their bidding. Spoiler: Jack will most likely have to prove his loyalty to The Others by performing surgery on Colleen in an upcoming episode.
In the preview for next week's episode, Further Instructions, it appears that the monster will chase Locke and Charlie, Desmond will be walking nude in the forest and cross paths with Hurley (who is presumably on his way back from the Pala Ferry), Claire and Charlie will be seen together, Locke says "I'm going to save Mr. Eko's life," and Eko appears to be dragged away sharply by someone or something strong. From an ABC press release: "The fates of Locke, Eko and Desmond are revealed after the implosion of the hatch, while Hurley returns to the beach camp to tell the tale of what happened when he, Jack, Kate and Sawyer encountered 'The Others.' Meanwhile, Claire is shocked to find Nikki and Paulo [Flight 815 survivors we haven't seen before] in Jack's tent [reportedly getting frisky]... Guest starring are Kiele Sanchez as Nikki, Rodrigo Santoro as Paulo, Ian Somerhalder as Boone [who will apparently appear in a dream sequence], Justin Chatwin [who played Robbie in the 2005 movie War of the Worlds] as Eddie [possibly a friend or relative of John Locke], Chris Mulkey as Mike, Virginia Morris as Jan, Joel Himelhoch as sheriff and Dion Donahue as Kim."