I know that this series of books has been brought up in conversation MANY times over the years here, so I wanted to share the pleasant surprise that I just got a few weeks ago: a release in book for of a compilation of some of the short stories he had released. (And he bound them together with some interludes, to make a 'comprehensive story', kind of like how Larry Niven did with the 'Crashlander' and 'Flatlander' books.)
Unfortunately, he had--since they fall smack dab in the midst of the pre-existing books' timeline...--to do them as the old, "So sorry, but this entire season of 'Dallas' was just a dream." :(
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So, "Port of Shadows", released 11-Sept-2018. Enjoy!