Per TV Guide:
Read more at;First the island moved; now Lost is moving to a new night. The sixth and final season of the ABC series is scheduled for a two-hour premiere Tuesday, Feb. 2, at 9/8c, TVGuide.com has confirmed.
ABC Sets Lost Premiere Date - Today's News: Our Take | TVGuide.com
I am not sure if I am excited about the switch from Wednesday to Tuesday, but I will be watching!!!!
ETA: Whoops, forgot to mention that they list the names of full cast members so this could be spoilerish for some of you.