I can confirm that there is a Region 1 DVD of this movie in the works, I believe it will be a Media Blasters release, and will feature both the standard theatrical cut of FORBIDDEN WORLD as well as the original 86 minute "director's cut" titled MUTANT as a bonus feature. Alan Holzman has recorded an interview for the disc, I was presuming it was going to be a Christmas 2009 release but have not heard or seen anything.
I e-mailed Media Blasters but they failed to reply, so in light of what I learned over at http://www.dvddrive-in.com/ about Shout! Factory acquiring some of Corman's movies from his New World Library, I emailed them about this one and GALAXY OF TERROR:
Here's my original query:
Shout!
I just learned you're releasing some Roger Corman Cult Classics, does this mean you have access to FORBIDDEN WORLD & GALAXY OF TERROR? They would make a great double feature, if you do.
And here's their sweet response, I think it speaks for itself:
Thank you for being a fan! As it happens we do have access to those films, and while I cannot as yet tell you when or how they will be released, you can expect them in 2010. Sincerely, Shout Factory