In a video interview with The Hollywood Reporter, the show's executive producer says that the final episodes are meant to answer questions, as well as provoke others.
"We're trying to end Lost in a way that feels Lost-ian and fair and will generate a tremendous amount of theorizing," he said. "We're going to be as definitive as we can be and say this is our ending, but there's no way to end the show where the fans aren't going to say, 'What did they mean by this?' Which is why we're not going to explain it."
Lindelof and Carlton Cuse, his co-executive producer on the show, have publicly stated that they won't comment on the finale after it airs on May 23.
Lindelof also revealed that the final scene of the series was not shot sequentially, since new sets had to be constructed for the purpose. "That would have been a very nice idea to [shoot the last scene last], but for reasons of maintaining the secrecy of the show, and burying it in the middle of the production schedule was part of it, and also, we had to build some sets for the finale."
ABC has an entire evening of Lost-themed programming scheduled for May 23.