That there is both a flashback and flashforward. Found out early this season that 6 people get rescued Kate and Jack was known about at the end of the last season when the first flashforward was done. Hurley was added to the list, then Sayed which left 2 more as the latest episode was Sun and Jin based it was fairly obvious that they were the remaining two as originally there was only 8 episodes planned this season due to the writters strike. But no, bit of a curveball only one gets off.

It was right up there with the episode where they show flashforwards of Kate off the island and that she has had a child, then the present time hints that she may be pregnant with Sawyers child but she insists she isnt. Then at the end turns out to be claires baby Aaron