Just started Cibola Burn. Looking forward to digging into it over the holidays. Was going to read Titanicus by Dan Abnett (probably my favorite of his books, even though it isn't in the First and Only series), but the next Expanse book was calling to me.
Also, I finished Catalyst recently--the prequel novel to Rogue One. Not a bad book, nice set-up of the relationship between Krennic and Galen Erso. I enjoyed some of the glimpses into "normal life" in the Republic during the Clone Wars and in the period before the Rebellion. Will probably read the Rogue One novelization sometime early next year--I've heard it's good, gives more info into some of the backstory and character motivations than the movie did (although I really, really liked the movie).