The Weinstein Company has announced today that Death Proof and Planet Terror (released theatrically as Grindhouse) will be released on Blu-ray on December 16, 2008.
Grindhouse was a box-office dissapointment (apparently because it was 3+ hours long) but gained a larger audience when it was released (as two separate movies) on DVD.
Planet Terror was directed by Robert Rodriguez and Death Proof was directed by Quentin Tarantino.