From the Shout! Factory press release here:

From Japan – the country that brought us such mythical movie monsters as Godzilla, Rodan, Mothra and King Ghidorah – storms Gamera, the titanic terrapin feared by adults and loved by children. On May 18, 2010, Shout! Factory will unleash Gamera, The Giant Monster – Special Edition on DVD for the first time in its unedited original version, with English subtitles — in anamorphic widescreen from an all-new HD master. The DVD includes a 12-page booklet with an essay by director Noriaki Yuasa, a photo gallery, trailers and more. The collectible Gamera, The Giant Monster Special Edition DVD is priced to own at $19.93.

The disc is currently up for pre-order at Amazon.com at a reduced price of $17.99.  Click here to order.