It appears that those Lost fans that have been looking for an ultimate resolution to who Kate ultimately ends up with, might be left unsatisfied.
Producer Damon Lindelof says:
“We’re moving into the endgame of the show [and] the stakes have moved beyond, ‘Who’s Kate going to pick?’ and into, ‘Is anyone going to be left alive?,’ I hope [viewers are] going to be satisfied with what we’re doing, but we’re not writing a romance novel here. I understand in seasons past how that was much more relevant. We’re not neglecting it, but there’s a lot of fish to fry. The elements of the love triangle — Kate’s relationship with Jack, her relationship with Sawyer, Sawyer’s relationship with Juliet, who’s dead — are a huge part of the season. All that stuff is in play.”