Yeah, I doubt those are the Others, which was my thought since they first showed up last week. I guessed they were some of the other 815 survivors.
Is Jack turning into a dick or what? At least with his reaction to Desmond in the jungle, there were some hints as to why he believes in science so much, apart from being a doctor, I mean. Perhaps he was right all along about what's her name's surgery and her condition worsened, or she left him for someone else, or something.
We still don't know why Locke is paralyzed or why his relationship with Helen went sour. At least one more Locke episode is forthcoming.