Why isn't Mr. Stephenson writing the script? Doesn't even look like he cares,...which makes me wonder if I should. On another note, Ender's Game is coming out

Why isn't Mr. Stephenson writing the script? Doesn't even look like he cares,...which makes me wonder if I should. On another note, Ender's Game is coming out and Orson Scott Card fought hard to get the right actors and write the script. Oh how I can't wait for this....