The sneak peak at tonight's episode can be found here - http://abc.go.com/primetime/lost/index?pn=indexWednesday 9/8c
The remaining survivors start to feel the effects caused by the island being moved, and Jack and Ben begin their quest to reuinite the Ocean 6 -- along with Locke's body -- to return to the island.
The preview is 1 minute 42 seconds long and the sneak peak is 2 minutes long, so it's actually decent.