TP published 10 volumes of Dazzle before going defunct. (That's another series where the next volume was announced but never materialized.) The series is currently at 13 volumes in Japan and still running according to BU Manga.
With GH v12, it's especially frustrating since Del Rey had finally announced its release. We were promised it but it never happened. There are a few other favorite titles that were in similar situations -- final volume announced but the company folded just beforehand. I think GH and Two Flowers for the Dragon (CMX) were the ones like that that hit me hardest.
Except for 1 or 2 small details, there's no information in the v12 that we didn't know or hadn't deduced. However, you'll enjoy how the info is revealed. Naru is still Naru, after all. So find it & read it! One other thing, I'm sure the v12 ending is slightly different from the novel because the v12 ending was clearly written knowing that a sequel to the series exists.
Speaking of the sequel, chapter 2 is also out.
Kodansha rep said somewhere that every title they're going to pick up from Del Rey has already been announced. No more Del Rey will be published. So no more GH in print.
JManga, the digital online site, has said that they plan to put up all the former Del Rey titles Kodansha isn't picking up. When I asked for GH, they said that they'll get to it & maybe raise it up in priority since I had begged for it. JManga is digital only, but they've talked about print on demand in the future. Lots of "ifs" involved but someday maybe maybe we can get a physical GH v12 through them.
Gah I still havent read it! And I just realized Im gonna have to re-dl it since the copy I had was on Shikimi. I have started the new series but only read chap 1, I dont even know if anything has been scanlated.
Ive been considering the idea of once a day tweeting the KodanshaUSA twitter account and asking them to please finally release GH 12, seriously this is ridiculous.