Trip, I heard on the "teaser" there would be a surprising revealation about 2 of the survivors, but not that they were related. Something referred to last season, but never gotten back to confirm, was that the real "Henry Gale", the black man they found buried near his hot air balloon, was the brother of Rose, the black lady suddenly recovered from a fatal illness. Or maybe they will get around to revealing that next week, who knows!
p.s.Mean Dean, I have to agree with all of your hypothesis.
But I'm still reeling with confusion over the episode with Desmond and his "Groundhog Day"/time travel experience!