I still haven't figured out if the "Updated" and "Commemorative" DVDs are the same, or if they just never plan to release the "Updated" version for sale.
Special Encore Presentation
“Inside 9/11” (Updated Version) Sunday, August 26, 7:00 – 11:00 PM ET (4 Hours with Limited Commercial Interruption)
We will never forget September 11, 2001 — a day of unimaginable tragedy, forever altering history and our place in the world. Now, the National Geographic Channel presents an updated version of its Emmy-nominated Inside 9/11. New details that have come to light have been incorporated into the special, including the trial of Zacarias Moussaoui; information about the existence of Able Danger, the highly classified military intelligence team charged with tracking al Qaeda; video of the 9/11 attack on the Pentagon and audio from Flight 93; the dissolving of the CIA’s bin Laden unit; the killing of al Qaeda’s leader in Iraq, Abu Musab al-Zarqawi; and recent tapes from bin Laden.