I went and bought it at the earliest, and was pleasantly surprised to find that they had included OpenStego v0.5.2 in the DVD, and also a great 2 page article on the functionality. The article author has explained it in excellent details, alongwith good diagrams and screenshots. It is better than what I would have written to explain the functions.
The link for magazine article (in Japanese) is at:
Article can be downloaded for ￥158 only.
Great going. :)
After getting inspired by this act, I have translated OpenStego in Japanese. I have not released it yet, but once it is released, if your OS locale is Japanese, then OpenStego UI and command line help will be in Japanese.