1UP have spotted this possible Halo 2 film script leak over at Latino Review (obvious warning: spoilers contained, if you believe it!). We're marginally skeptical over here; also, entertained already: Master Chief "is over seven feet tall" and speaks like Arnie:

[Master Chief] looks to the left, then his right. Then down at the two men. He towers over them and they seem to shrink under the blank gaze of his visor as he speaks his first words on page 10 of this script. What are my orders? Now that is dialogue. That is cool.

1UP have written to Microsoft asking for a confirm or deny, which they'll post as soon as they get a response, hopefully today...