Rumors are circulating that Republican Senators may organize two filibusters.
The first is a relatively straight forward one by Mitch McConnell from Kentucky. He believes that the Democratic leadership is going to introduce legislation cutting funding for the war and will organize a filibuster against it. In order for it succeed he needs the support of at least 40 Senators in order to prevent cloture.
The second is more interesting, at least the way I've heard it described. John McCain is threatening to filibuster minimum wage legislation. According to this story the goal is to cement his appeal to Republican Party activists. A separate story suggests that this is merely meant to delay activity on the Senate floor so that the non-binding resolutions now being introduced cannot make it to the floor for a vote.