Update: 15:00 Thanks to TiTcH from Lost-Streams.com for this nice HQ version of the video.
A featurette has been released in anticipation of "Lost" 5.03 titled "Jughead". It is a video interview with some of the cast of the show, including Naveen Andrews aka Sayid, Elizabeth Mitchell aka Juliet and Michael Emerson aka Ben, talking about the idea behind the new season.
All three of them hint on what viewers can expect from the fifth season, including whether the Oceanic 6 will return to the island or not, and what happen to the island that the survivors get attacked. Elizabeth in particular said that a lot of the flashback scenes on the island will unravel the people they love but cannot see, thus it will be rather heartbreaking.
"Jughead" will air January 28. Desmond goes in search of a woman who could be the key to helping Faraday stop the island's erratic movements through time, and Locke discovers the identity of the unknown forces who have been attacking the survivors.