Then, later in the day, the filmmaker came back with a postscript, adding, "I bet it is something from Hasbro. This time they are not doing a comic book of the movie because we want to keep our story under wraps. It must be their version of a comic themed Transformers story they are creating."
Indeed, that seems a likely possibility. As Blastr points out, considering the sheer number of additional characters, this leaked script would probably be better suited for animation or a comic book arc.