The final two books in the separated threads of the Honorverse "main" timeline were Uncompromising Honor (2018) and Shadow of Victory (2016)
While Uncompromising Honor wrapped up the Manticore-Solarian League conflict into a reasonably neat little bow, Shadow of Victory ended with Mike Henke's tenth fleet arriving at Mesa to witness a self inflicted nuclear holocaust as cover for the top brass of the Mesan Alignement scooting off to parts unknown.
Given the Mesan alignement have been revealed over the last 6-10 books or so as the driving engine of most of the interstellar conflicts, I was surprised to see that this plot point was left so open-ended with little apparent interest in follow up from an in-universe perspective.
Have I missed a release that hasn't made its way to Wikipedia or Goodreads lists?