I was listening to Star radio in ATL and they played a European podcast that interviewed Evangeline Lilly about her new role in The Hobbit Desolation of Smaug. After touching base about how the host was a LOST fan he asked her "are you happy with the way LOST ended". She replied "LOST didn't actually end, thats what people may not be understanding yet". They asked her to elaborate but she declined to comment further.
probably has to do with what you beleive happens after death.