I honestly don't know how long this book is going to go. It's the end of the second trilogy and there's a lot of ground to cover. I've also been trying to decide how I want to end the series.
Next book may/may not be the last of the CoM books, at least for this story path. If I continue these, it'll probably go off in a different direction that will make sense with what's happened, but completely flip the script of what I've been doing thus far. We shall see. For the time being, I know what I want to do with this book and the next, so I have some time to ponder.
As to book 6, everything is going smoothly, you'll see a lot more play on the UHD idea and of course all the usual suspects will make an appearance somewhere in the book, mostly in major roles. This book is, much like 5, written mostly from M's perspective. There's good reason for it that will make sense by the end of book 6.
In case you missed it, or I forgot to mention it in the previous post, this book is called "The Purge". So, here we are coming full circle with many of the ideas brought up by book 1, 2 and 3. It's going to be a fun ride, you aren't going to want to miss it. Who doesn't love a good end of the world scenario?