TVGuide.com: Is Kate going to end up with Jack or Sawyer or end up alone?
Cuse: Well, we know what’s going to happen to her, but we’re not going to tip what’s happening to her. But we definitely know what the resolutions of the characters are and we know that people care a lot about the Kate, Jack, Sawyer, Juliet quadrangle and that will be something that you’ll definitely get some resolution on this season.
Lindelof: And I think it’s great that you actually present that Kate might end up alone as an option, because a lot of people say, “Is it going to be Jack or is it going to be Sawyer?” But that presupposes way too many things that they’re not fully aware of in the final season. So there may be a couple of other options that are in play that people aren’t considering yet.
Source: TV GUIDE