I went fishing around Capcom's Japanese site and found it. It looks to be... an official blog about the making of the book? *puzzle* I can't babelfish it for some stupid reason... and google's translation makes no sense whatsoever. (I usually rely on babelfish as being SLIGHTLY more lucid, though both are awful ;p)
Tucked in there is this adorable piece of art:
I've seen sample pages from the book floating around, but so far, it's nothing we haven't already seen online, or too small/obscured to be of any use. *sadface*
ETA: BTW, here is Capcom's official page on the topic:
I'f I'm understanding this correctly, the book is largely and primary an art collection- every scrap of art for every game they could find, more or less. (They do say. "イラスト収録点数は3000点を超え、さらに当時の開発者が語る“ここでしか読めない裏話”も収録しております。" but that could be like, y'know, a PAGE or two.)
I don't anticipate there being a great deal of illuminating text... however, it's too early to say. No text=no more goddamn retcons, but also no answers...