The new book is called Wolf Island. It came out in October, so I think that's the one you're thinking of! It's from Grubs' point of view, and it's quite short. But that's the only bad thing about it! I think it's just because I like huge, thick books. Haha.
I love all of Darren Shan's books, I remember when I was about 11 or so, I was given some books by the book shop for some reason. I think it may have been for a prize at the school fete. But somehow, I managed to keep Cirque du Freak and I left it under my bed for ages and ages. When I finally got around to reading it, I was shocked as to how I had let it go unnoticed for such a long time, because it's a really great book. A great saga for that matter