Hey, I'll bite too.
What was the origin of the Tri-Tachyon Corporation? Were they a pre-Collapse corporation, or were they organized in more recent years? Are they actually mostly about business and profit, or do they cling do the whole corporate structure as a kind of mystical talisman of a bygone age, a way of organizing society in opposition to the Hegemony model?
What are decivilized worlds like? Are they mostly horrible, incompletely terraformed wastelands where people barely survive, or are there relatively hospitable ones where society has stabilized at a pre-Space Age, but still technically civilized stage? Little medieval kingdoms fighting over the ruins of the old Domain?