Read this post from Venturebeat then decide...
"Elan Lee, head of Fourth Wall Studios and a veteran of alternate reality games, confirmed that Sadie’s Story is a joint effort between Bungie’s Joe Staten and Fourth Wall Studios. But he says that gamers are supposed to discover the story on their own and so his lips are sealed for the moment. There is reportedly twice as much audio in Sadie’s Story as there is in ODST itself."
Read the full post here...