You'll see more of Walt in season four of Lost, say the show's producers. The kid, played by Malcolm David Kelley, vanished during season two but turned up mysteriously in the season three finale. Other Lost spoilers: that coffin we glimpsed at the end of the finale does belong to someone we know. Also, the producers clarified that our heroes had been on the island for less than 100 days by the end of season three. And we'll see more "flash-forwards" to the future in the next season. [Sci Fi Wire]