Excellent news. I, too, would be interested to hear the workings on this, though I doubt that will happen. I notice that the cover has a new "Unofficial and Unauthorized" stamp on it now, which was probably at Konami's request. Nevertheless, it's a great book. Along with the underrated and downright fun SNES Dracula X getting released for Wii U, it's one of the best things to happen for Castlevania in years. I ordered a copy back when it came out, but never got to get its Kindle version until now. By the way, the two are connected via Amazon's Matchbook Program, so you can get the ebook at a discount--even free at the moment, it seems--if you buy the physical copy.
Now, if Konami's listening, I'm waiting to get a Castlevania: Bloodlines release on Wii U! (And a Contra: Hard Corps release, as well.)