In the Traveller5 Book and in the Traveller5 CDROM we can read about a few interesting things that will expand the current “Charted Space” of the OTU to a galactic scale. There are a few hints that we can expect some epic adventures. If we look at the image of The GALAXY (p. 417 or in the CDROM) we can see many interesting things. In the map in the book these are called Scattered Hydrogen Societies. I have added these on the Milky Way map below.
From the top there is first Dushis Khurisi. Searching the interwebs I found it in Eaglestone’s Vilani Dictionary. The meaning is “poem“. This made me suspect that this was something from The Galaxiad. And there it is! Dashus Khurisi (slightly different spelling) is a Vilani Empire on the other side of the Galaxy.
In the Galaxiad Intro, the Abyssals, the Barren Worlds and the Essaray are also mentioned among many other interesting things. But there is no answer to what kind of Scattered Hydrogen Societies the SRAL and Denizens are. There are some notes about the Black Fleets that we remember from the Kickstarter Project (at the $ 25 level and above).
The first time I heard about the Barren Worlds was when Clifford Linehan was mapping the Zhodani Core Route. (His site is now offline.) He then discussed this with Marc Miller. That was 13 years ago. Marc must have been planning this a long time.