| Season 4 Finale: Speculation & Spoilers.
DarkUFO, Lostpedia and The Tail Section all have what they claim are spoilers for the season finale, so I shall share the ones that overlap with each other in the hope that they're not BS:
Keamy's men are taken out by Richard and the rest of the others (including Sawyer and Kate).
Ben kills Keamy in the Orchid. Ben and Locke "move the island" by turning a giant frozen wheel. Ben tells Locke the island moves through space AND time. This is why Ben is wearing the parka when he ends up in the desert.
Michael Dies when the boat blows up due to keamy's device. Jin is blown in the water, but Jack and the rest of the oceanic six don't go get him because of weight issues or something, this is why Sun blames Jack for his death. No mention of Desmond, from what I can gather.
There isn't room on the helicopter for Sawyer, so he and Kate kiss goodbye. This is the "big spectacular kiss". Pretty shitty.
Locke is the one in the casket. Ben followed Jack and told him that they need to go back to the island to resurrect him, hence WE HAVE TO GO BACK. | 
