Now, there's a sequel (more like a prequel) to P&P&Z. The title is Pride & Prejudice & Zombies: Dawn of the Dreadfuls by Steve Hockensmith (and Jane Austen). Here's the book trailer for it. Would make an epic movie, too.
Speaking of movies, Pride & Prejudice & Zombies is being made into one, starring Natalie Portman as Elizabeth Bennet.
All books mentioned in this post are published by Quirk Books.