ok maybe i can clarify a few things. Currently the only thing we know about the movie is that Lorenzo DiBonaventura bought the rights to the movie. Michael Scott will be a producer (which may or may not mean creative control/input)
There is not script yet, there isnt even a writer for the script (Michael has said he wont write the script either because he has books to finish writing) which means there is not movie to cast for yet, and because there is no script they dont know what will be in and left out of the movie, (in fact you usually dont know fully what is left out of a movie made from a book, until the movie is released in the theater)
Movie making is unfortunately a slow process, and many months will probably pass before we hear more movie news, and in between bits of movie news. But rest assured as soon as we have more information about the movie, Michael Scott and the staff of flamels immortal portal will make it available to you!