Packt Publishing has just released IBM Lotus Notes and Domino 8.5.1, authored by Barry Rosen, Bennie Gibson, Brad Schauf, David Byrd, Dick McCarrick, Joseph Anderson, Tim Speed.
With Lotus Notes and Domino 8.5.1, IBM has once again provided business users with an intuitive, fully integrated platform to enhance each user’s experience with business communications, while reducing Total Cost of Ownership (TCO) and increasing Return on Investment (ROI). You can create and share information effectively to make quick business decisions and streamline the way they work. It is no longer just an email tool, but a means of extending business communications to a new level. In order to utilize all the powerful features of the new release, you need to upgrade your existing system to Lotus Notes and Domino 8.5.1. Written by senior architects and specialists of IBM Software Services for Lotus, this book will be your guide and enable you to quickly upgrade your existing system and leverage the full capabilities of Lotus Notes 8.5.1. The authors explore the enhanced productivity tools available with this release by integrating word processing, presentations, and spreadsheets into a seamless unit with your messaging and collaboration solution. The book starts with an overview of Lotus Notes and Domino, including all the exciting features in the new version. You will learn to utilize the efficient productivity tools that are shipped with Lotus Notes client, and discover the updates in Domino server. You will learn the specific steps needed to upgrade to Lotus Notes 8.5.1 with detailed explanations so that you can upgrade from any previous Lotus Notes and Domino release
You can view the books Table of Contents and they are also offering a free download of Chapter 8: ‘What’s New In Notes/Domino 8.5 Development’ 
I bought the previous release of the book on spec and was disapointed with that. Looking at the TOC this one is likely to disapoint anyone interested in the mechanics of upgrading. For those people there were talks at LS10 which would be more useful if you can get the presentations.