“Lost” really will get 48 episodes over a three-season span, as first
announced. It had planned to start that with 17 this year, but the
strike only gave time for 14. Those extra episodes will be tacked on
somewhere in the final two seasons, so the show still has 34 left. One
complication: “Lost” rushed some of its stories so it could reach the
points it wanted to for the season finale. Now it has a little more
room to play.
Souce – LSJ.com