http://www.thetailsection.com/lost-news/scant-season-four-details.php

"(...) Kristin Veatch reports that Harold Perrineau has been offered his job back as 'series regular.' Rumors were circulating to this effect MONTHS ago, however. It was also reported at that time that the creators had a plan to deal with Walt's aging. Hmm... Flash forwards + Plan to deal with Walt's aging = Perrineau returning as regular in the future portion of next season. I supposed we will also see Walt going all Zen on us, learning to project himself into the past. "

A więc Michael powróci w 4 sezonie. Hmmm... Może to on był w trumnie w flashforwardach Jacka z "Through The Looking Glass"?