Beginning January 31st, Lost will begin it's 4th season, and the first in which it will not be airing on Wednesday nights. Though the writers' strike means that we will likely only see eight episodes from the show this season, all of them will play out on Thursday night at 9PM, otherwise known as the Grey's Anatomy slot on ABC.
What this means for Lost is that they will not have to go up against the one show that no one wants to compete with during the writers' strike, that being American Idol. Also, the producers of the show want you to know that nothing concrete is going to be resolved during the eight episodes you'll see this season. Just, you know, so that nothing's changed.
Los Angeles Times.com: 'Lost' returns: Half empty or half full?