We're just a few weeks away from the U.S. DVD release of another Doctor Who special, 'Doctor Who: The Next Doctor'. This was the Christmas 2008 special, with David Tennant as the Tenth Doctor and written by Russell T Davies. The DVD arrives September 15, 2009. This is only being released on DVD, and not on Blu-ray.
See my Doctor Who lists on Netflix:
Doctor Who: All Available
Doctor Who: New Releases