I'm thinking about starting up the Lost Fleet series in Audible! I've got a few credits built up and a long drive ahead for the move.
As for me, I've been reading an old (1990) book called "The Art of Wargaming" by Peter Perla. This book has some fascinating history of how wargaming developed, and also how wargaming was used at the Naval War College. There is a new edition out as well, but I have a copy of the first. As such, some of it is dated, but the history portions from the 18th, 19th, and 20th centuries are still pretty good!