Well we know that Vargr are inherently suspicious of long-term stability. They see the 1000 year old government of the Third Imperium and the even longer tenure of the Zhodani Consulate as 'Humaniti's steamroller' absorbing worlds and crushing the Vargr propensity for 'responsible change'.
And we all know that the Imperium and the Zhos see the entire Vargr Extents as the banana republic junta of the week. Were it not for some border worlds being absorbed to stabilize the borders, both governments would have as little to do with the Extents as possible politically. Sure, they're happy to do business, exchange in some minor diplomacy, and patrol the border heavily, but beyond that they're happy to let the Vargs stew in their dog dish.
But none of this is any more convoluted than the diplomacy the Imperium has to do with the Aslan. So how DOES a Vargr government become 'stable'? For that matter, how do you define 'stability' in a Vargr context?
With all that on the table, yeah, I could see Vargr book that details not only the governments but also delves into Vargr cultures. What makes Aekhu different from Irilitok?
But looking at some of the artwork that's come out for the Aslan and Vargr, I'm afraid that the the Imperial Palace of the Thoengling Empire is gonna look like some sled-dog head with a roller coaster coming out of the mouth.