Lawrence Guterman is not, in fact, directing the movie or has any part in it.
In a very recent 2007 AFC interview, Colfer stated the following:
I have been working intermittently on the screenplay for the past year with Jim Sheridan the Irish director. We have kept the heart of books one and two but I also wanted to do something cinematic and spectacular so we added a big exciting ending. No new characters but plenty of new one liners. I really love the story and we hope to go into production this Summer. No cast yet.
