Вот недавно нашел.
Для тех у кого хорошие знания английского языка.

There has been confusion around the web as to when Lost Season 4 actual starts for those wondering it is season 4 starts January 2008.

It was announced that Lost will continue for a fourth, fifth and sixth year, concluding with the 117th produced episode of the series during the 2009–2010 season. These three final seasons will consist of 16 episodes each, running weekly in the spring— uninterrupted by repeats.

Although the annoucement says that beginning with the 2007-2008 television season, the final 48 episodes of Lost will be aired as three seasons with sixteen episodes each. Thus, Lost will conclude with its sixth season. These seasons Do not start until the last Wed in January 2008 and are to air uninterrupted from February to May.

Короче как я понял что будет 6 сезонов, и 3 следующих сезона будут по 16 серий, и сериал будет идти до 2010 года.
А 4 сезон уже выйдет в январе 2008.