This book is not focused on a specific demographic or specific type of person. If you've never heard of CD or DevOps, this book will give you an insight into what all the fuss is about. If you have already set out to adopt CD and/or DevOps, then this book can help by providing some useful tips and tricks. If you know everything there is to know about both/either subject, then this book will help reaffirm your choices and might provide some additional things to chew over. All in all, the target audience is quite broad: anyone who wants to understand how to painlessly and regularly ship quality software.
Previous knowledge of DevOps practices, CD, or using DevOps tools is not necessary.