Update #5
Marc just posted this to the Kickstarter campaign concerning changes, checks and proof-reading this new version:
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Inquiring minds want to know.
Soon after release of T5.0, Don McKinney began compiling an errata for the book. That material consisted of typographical fixes, formatting fixes, and rules clarifications, and general suggestions. Much of that was implemented in Traveller 5 dot 09, most notably the addition of an index.
After the release of 5 dot 09, I came to the conclusion that--for a reprint--a reformat to three Big Black Books was called for, and I restructured the material to meet that need.
In addition, I felt that the Personal Combat system and the Space Combat system could be improved, and I devoted some design time to perfecting them. I am especially pleased with both, and I believe they are significant improvements.
I work with a variety of enthusiastic and opinionated Traveller people who review what I write, note problems as well as format and textual errors, and provide constructive criticism. Some could care less about characters, but love ships, and vice versa. Their work has been invaluable to me, and this edition is much better for it.
I have also engaged a variety of lay or casual readers to provide their opinions and suggestions. Some of them have provided only minimal or casual responses, while others have given me detailed feedback. Their work differs from the experts, but also has been invaluable to me, and this edition is much better for it.
As to page counts,
T5 Beta (10 years ago) was 513 pages (plus 9 pages of title and contents),
T5.0 was 647 pages (plus 9 pages of title and contents).
T5.09 was about 731 pages (plus 9 pages of title and contents, and 19 pages of index).
T5.10 is three books with 828 pages:
Book 1 is 264 pages (plus 9 pages of title and contents, and 9 pages of index).
Book 2 is 280 pages (plus 9 pages of title and contents, and 9 pages of index).
Book 3 is 284 pages ((plus 9 pages of title and contents, and 9 pages of index).
Hat I find interesting is that in addition to the increased page counts, each version has shed about 10% of the previous page count as not-working, or uninteresting, or not-necessary.
Considerable examples have been added which help understand many of the processes. These include both narratives (basically combat examples and such) and pre-generated items using the systems.
I have within the last several months) recruited several volunteers to read the final texts, and their assistance has been helpful in making sure corrections have been made, and that the text properly conveys the ideas it is supposed to. In one instance, a proof reader misunderstood the purpose of a table, which prompted me to more fully detail the use of the table.
When I finished T5 dot 09, I was thoroughly immersed in the game rules, and it prompted me to write Agent of the Imperium. That exercise showed me aspects of the Traveller universe that mere rules could not. When you read it (or listen to the audiobook), you will similarly find that you see the Traveller universe in a new light. And by the way, the AudioBook CDROMs include an annotated text of the novel (in PDF) with 300+ footnotes providing details that may not be obvious, but are nonetheless important to understanding the OTU.
Is this edition perfect? No. Is it a substantial improvement over the previous? Yes. More playable, more coherent, and better than before.