Coming to DVD on 1/27/09--in 3-D!!
This film is scheduled for DVD release on January 27, 2009, as listed with Amazon.com. It will be the original 3-D single X version, not the later "hardcore" version with the phony inserts. With the vintage period material and settings, the 1970 version is much more fun, IMHO.
The DVD is listed as a two-disc special edition, so presumably the second disc will have interviews with original cast and crew members (such as star Christina Hart), as well as the director and producer.