Today, I went to see Maggie Stiefvater at BookPeople. Other bloggers in attendance, based on bookmarks or business cards I received, include the ladies of Girls in the Stacks, Mystical Lit Lounge, Windowpane Memoirs, and Project 52.
She said that she did quite a bit of medical research as well as research on dead German poets (for Sam's point of view), but didn't read any werewolf books. After all, she knew what werewolves were. Long anecdote short, she chose werewolves because of childhood phobias and Teen Wolf.
During the Q&A, Maggie was canny about some of her answers - she wouldn't discuss happy endings or hook-ups. The secret novel comes out in Spring 2012 and contains both beaches and kissing. She's seen the cover of FOREVER, but won't reveal the color yet. (I'm hoping for yellow with goldenrod text.)
Other questions she elaborated more, sometimes with her trademarked anecdotes. Kraken are the New Vampires goes viral more than anything else, although apparently the story of her hearing about being #1 on the NYT Bestseller list is being oft repeated, with embellishments in the case of the Hungarians. Also, there is a third Book of Faerie, titled REQUIEM, and is told through the point of view of an already introduced character and finishes Dee's story. It got pushed to the back of the line and may get pushed back again. SHIVER has been optioned; the screenplay is written (not by Maggie) and is currently undergoing rewrites. Maggie has a small consultation role, but no real power over the movie.