Coming out late in the year is irrelevant. There can only be one contender for this, and that has to be the Seventh Edition of Trevor Montague's A-Z of Everything. I think most quizzers will already be aware of this book, and many of you will have 7 editions, but with 1300 pages of quizzing gold this is worthy of a place on any bookshelf.
For anyone new to the world of quizzing, this is a perfect place to start. Another monumental effort by Trevor and an update well worthy of the £26 asking price.
I just wanted to add an honourable mention somewhere to a superb book released by Alan Connor this year. Entitled "The Joy of Quiz" it really is worth your time, giving good coverage to the hobby.