Woo-hoo! Just checked Amazon; Pratchett's next book, "Thud!" comes out in October and it's a Watch book, which are always my favorites.
Isn't it about time for Rincewind and The Luggage to show up again?
I would follow Carrot past the Gates of Hell and back again, and would report it all to Mr. Vimes. Pratchett writes his characters with great depth and beauty, and in his own way makes me feel their joys and pains no less than Rowling...but it's still the difference between Gilbert & Sullivan and Carmen.