- The Island did not move when Desmond turned the failsafe key at the end of the second season, even though this event, like the frozen donkey wheel-induced disappearance of the island, both were accompanied by a bright purple sky.
- For that matter, the island did not physically move after Ben turned the frozen donkey wheel (which most likely means it just jumped to another time).
- Jin and Locke, both of whom apparently died in the finale, will appear in some form this season.
- The flashback/flashforward narrative structure will still show up from time to time, but will gradually be replaced with an as yet undisclosed new storytelling device.
- Richard Alpert will be around more. He is "old", though exactly how old was not revealed. We will see him barefoot this season.
- Along the same lines, the mystery of the four-toed statue from the finale of Season 2 will be explained this year.
- The true history of the late Danielle Rousseau will be revealed this season, as well, though not in a flashback sequence.
- The extras whom Farraday ferried out to the freighter are dead. Not so for Farraday, himself. Also, expect the ever-resilient Vincent to survive until the series finale.
- Kate will see Sawyer again.
- Daniel's notebook (the one containing all the inside knowledge of DHARMA's presence on the island) will figure very prominently into Season 5.
So that's about it. They're now four weeks into writing season 5, with production set to begin in about another 2 weeks. We can expect Lost to return in February and run for 17 consecutive weeks (or, perhaps, 16 consecutive weeks with a 2-hour finale - the point is, no breaks).