The novel Haken Anime! was written by Mizuki Tsujimura with illustrations by CLAMP. It was serialized in an・an magazine from 2012 to 2014, each chapter featuring an illustration drawn by CLAMP.
The novel was compiled in a book that was released in 2014. Apart from the cover and one inside illustration, none of the other illustrations drawn by CLAMP were included in the book release.
It’s been announced that a paperback version is going to be released on September 6. The cover for this edition can be seen on the right.
If the majority of CLAMP illustrations were not included in the book version, chances that they are going to include them in the paperback version are very slim, if you ask me. That is a shame, since the illustrations were so nice. But who knows?
Source: Haken Anime! Facebook page.