Great documentary!
I don't know where else you would've seen Seagal and Isoyama together like that! Into The Sun looks like it'll be a very enjoyable film (seeing as it's Seagal coming back to his 'home' land and all). They've also mentioned that he's worked on two more movies after ITS (I'm guessing it's the other two that are mentioned all over this forum).
I think the episode is not available on DVD yet because the documentary was just released and the response to the show could not be predicted so they for now just offer the VHS version. I do think however, that in time the DVD version will be offered (for one, because VHS is more or less an obsolete technology).
All in all, I was very impressed with the way the documentary was put together. However, as a documentary, it focused more on Seagal's recent and ongoing work, as opposed to Seagal's encompassing history (as is the whole point to a documentary). Nevertheless, mystery is the whole point to life, and it wouldn't be fun otherwise. So, I guess we are better off not be told everything explicitly as we may think we want to hear and know.
Steven Seagal's generosity was seen and it was interesting to find out that he donated so much money to the charity that his friends were even worrying about him giving away everything and just becoming a monk.
Behind the scenes of Into The Sun were fascinating to watch, but for me, what I enjoyed the most were seeing the footage from his days in training (I gotta get that Path Beyond Thought some day) and his visits to the church where the kids were looked after.
One word: Impressive.