Ender's Game/Shadow is in the works, though it looks like it is still a long way off. Here is a link for anyone interested:
http://www.philoticweb.net/movie/
Just don't believe that first post (posted on April Fools Day). I am pretty sure the rest of the site is serious.
I too am worried about the making of this book into a movie as it was too good of a book to see butchered by hollywood. Though, it sounds like Card is very involved in the process of making the movie, so there is hope!