Well, turns he wanted to do one, but had problems convincing the studio. Cinematical reported today that on his MySpace page, Aronofsky has announced he'll be recording a track and making it available for freebie download soon.
He also urges fans to write the folks at Criterion to persuade them into investing in a proper special edition DVD: "i (sic) got a lot of extras in my bag so who know maybe if you all write to criterion they'll get interested."
You can write them at mulvaney@criterion.com.