According to one of Dark's sources, in an upcoming episode, half of the Oceanic Six returns (from what we've seen from those BTS videos, seems like it'll be Jack, Kate, and Hurley) and their return is kind of a big deal. The ultimate squeefest? "Juliet and Sawyer are living together."
Now, it's possible that they're just roommates, but, uh, doubtful.
And I'd really like to know how possible y'all think it is that, if the Suliet thing really happens, the couples could ultimately end up doing some bizarre swappage thing. Seems highly unlikely to me.