We have been contacted by a number of people asking about the new titles announced last spring. Here is the official update as of October 1:
Isometric Game Development with Corona SDK is making steady progress and is approximately 30% complete as of Oct. 1. We are using Tiled map generator if you are curious as to the tools.
Game Development with Amazon Lumberyard is over 50% complete as of Oct. 1. Since we started writing this textbook, Lumberyard has come a long ways and we are very excited to be working on this project. This will be the first of a series of textbooks on Lumberyard, each progressively more complex. We currently have 4 books planned and in development in the series. The first book introduces the developer to 3D modeling with Blender, texturing with GIMP, and creating a game with these objects using Lumberyard.
Will there be an early release? Once we have over 60% complete, we will consider releasing a title at the discounted early-release price. There are many factors that contribute to the early release of a book, the most important being at what point is the book is usable/educational. Watch this space and our Facebook page for more information.