Less than three weeks into "The End", the script of "Lost" series finale practically becomes a valuable item. An Italian site by the name of Macchianera has claimed they acquire several pages to the script which is supposed to be confidential. While its authenticity is still arguable, DarkUFO which has been keeping track of the series, said the script is accurate.
Based on the writing, it's known that [Spoiler Alert!] Ben is back on Smokey's side and thus holds Sawyer at gunpoint when he tries to knock out Smokey. However, Smokey has given up the idea of leaving the island with the Candidates and instead prefers to destroy the island. In order to accomplish this, he'll need the assistance of Desmond who is no longer down the well after being rescued by Benard and Rose.
The couple is still hiding with Vincent the dog but since they save Desmond from the well, they have broken their own rule of not interfering. Smokey threatens to give them a painful death until Desmond agrees to follow him. Desmond succumbs to Smokey's order.
The script is indeed in line with the leaked call sheet which mentions that Vincent will be part of the finale. But neither ABC nor the creators have issued a comment about the leak. Damon Lindelof and Carlton Cuse simply wrote on their Twitter on May 3 night, "We're done. Amen."