Non-Spoiler alert! 
LOTR: The Return of the King: 'Jay' talked with a source within WETA very early in the New Year who has news that some might find a little disheartening: "This time around '******' worked on Gollum. He explained all of the difficulty and the basic problems that they had to work around. To make a long story short, I asked him if he was to continue working on Gollum or if he would get to work on Shelob. He told me that he didn't know and that they had not even started to work on Shelob at all. The rumor that the upcoming trailer would have images of Shelob are most likely incorrect from what I have been told. Although the principal shooting had been done, the special effects won't be finished until the release".