Will the book be written in a lame "modern", movie-like style with 27 short chapters and narration jumping between main plot and some secondary events, that are supposed to be somehow "vital" to the story, or maybe in a more classic, epic style, with 27 long chapters, solid storyline and the narration fluently passing from one important event to another, without artificially prolonging the book, with the reason being the inability of the author to focus on a main storyline without making the book ridiculously short?
I hate modern fantasy books. Sometimes the events around the main character are really interesting, but the author usually forces the reader to go through dozens of boring side stories concerning way to many other characters. And so I read this one, quite interesting, but 10 page short chapter about the main character, but then I have to jump to the other side of the world like three times and read about three other characters who for some reason don't have any contact with eachother. If I'm supposed to wonder what is happening to the friends of the main character, while he is hidden in some forrest learning some awesome magic from the elves, why not let me wonder? Instead, the author shows me everything every ten pages. If a main character worries about his friends he hasn't seen for months - good, but why do I have to know what they are doing, while he doesn't? You know what is the most interesting part of any book? That you don't know everything. The story of the main character may be like 20% of everything that is going on during the book, but why take all the suspense and show the reader the other 79%? What, you really think that other 1% you don't show is going to make me interested? Damn, you're dumb. If someone has to create 5 parallel stories in addition to the main one, then it means that he just can't write more than 100 pages about the plot he invented about the main character. And that means he shouldn't write any more than 100 page novels at all.
I hope your book isn't going to be like that though. Although I have suspitions about this "introducing" to the world. I haven't experianced something like that working in a book. You are able to write a book with both the story and lore, I believe in you.