English-language series releases include publishing of the titles in special "premium" editions: "Premium Hardback" (print) and "Enhanced Ebook" (digital). These versions contain additional material and artwork, and are published several months before their general-availability or regular edition counterparts. The first title to appear in "premium" editions, in October 2012, was Angel Exterminatus (Book 23). The earlier catalogue of the series is also republished in these editions, again beginning October 2012 with the series-opening novel trilogy.
