Considering the pre-orders for Vol. 39 are going to ship in like two weeks it's interesting that we don't know the extras yet.
It looks like they’re up now:
Chuck Love And The Anatomy Of A Theme Beyond Transparency: New Featurette About The Amazing Transparent Man Showdown In Eden Prairie: Their Final Experiment The Last Dance: A Documentary Special That Chronicles The Final Days Shooting The Last Episode Of The Original Run Of MST3K, Diabolik. Behind The Scream: Daniel Griffith On Ballyhoo Theatrical Trailers 4 Exclusive Mini-Posters By Artist Steve Vance