Entertainment Weekly has a brief interview with Carlton Cuse and Damon Lindelof about the decision to end LOST after three more season.
They also talk about the rest of this season, and even specifically say we’re going to start getting some answers.
“And more importantly, we meet Jacob — the elusive, unseen, presumed
leader of the Others — for the first time. And this is a character who
is every bit as significant to our universe as the Emperor was to the Star Wars universe — a character that you didn’t get to meet until Return of the Jedi
but was referred to all through the preceding films. Jacob is a guy who
is going to have a very significant, ongoing sort of story value in our
show.”