Todays info from NOX: "Most of the NoN frames are finished, I'm now in the process of turning all the pictures into a book, then I have to write it. There are nearly 10,000 frames I need to work through so...it'll be a while."
You don't want to know.. Just set a reminder for 2027 and forget about this.
But to give you an answer, author is not happy with the alignment between the chapters and the acts he had in mind so he's revising the ending to chapter 2 and including some of what is already planned for chapter 3 to be added to chapter 2 - hence chapter 2.5.