There’s going to be a clip show and, alas, no new episode on Wednesday, April 22, 2009, in the show’s regular timeslot, 9:00 pm to 10:02 pm.
According to an ABC press release (via Dark UFO), the clip show is called Lost: The Story of the Oceanic 6, and from the description, it sounds as if it’s going to be covering mostly material from Seasons 4 and 5.
My guess is that the clip show may untangle the flash-forwards and follow the storylines of each of the characters, perhaps in a way similar to what was done in the Season 4 DVD special feature Course of the Future: The Definitive Flash-Forwards.
Speaking of which, here’s a very brief clip of Darlton (producers/writers Damon Lindelof and Carlton Cuse) talking about Course of the Future — and goofing around — at last summer’s Comic Con. These guys crack me up: