I have fairly high expectations for the movie at this point. Considering the comments made by the Strausse brothers, claiming that they are going to be taking both creatures back to their roots, it sounds very promising indeed. Although obviously the creatures alone won't make the movie great, but if they are pulled off properly, they could very well add a great deal to it.
December 2007 can't come quickly enough for me (assuming they don't change the release date before then).