Part 1 http://www.comicvine.com/articles/in...s/1100-150496/
Part 2 http://www.comicvine.com/articles/in...a/1100-150552/

The most important bit I think is this:

The HELLBOY IN HELL stuff is really what it's shaped up to be is four trade paperbacks worth of material that tell one, big story and kind of get Hellboy where he's going and resolve a lot of things and finally put certain things to rest and answer thing question and that question. It wasn't originally supposed to be like that. It was supposed be a prorate of small, little, odd stories and those stories started connecting up and certain events that happened in the first series, I realized they were very big events. They would impact this and they would impact that and here I am with this big-ass epic that I didn't really plan on. Issues 7 and 8 are a two-issue story and they do stand alone to a certain extent, but they do kind of resolve something that started in the first series, so it's done in small increments, in one and two issue stories, but they are telling one big story.
Now let's just hope that Mignola will have some time to draw.