I've been a Cornwell fan for well over twenty years. I ate up each Sharpe novel as it was published and the same with the Starbuck novels. I've been waiting a long time for him to return to our Civil war, especially since he moved to the USA.
His recent book about the American Revolution, The Fort, is excellent. It's not a "hero" type novel as are the Sharpe and Starbuck series, but it was riveting to me - and enlightening, especially in regards to one of the great American folk-heroes. (No name, I can't be a spoiler.)
Finally, I have to say that Cornwell's works have been one of the primary standards I have held my own Civil War novels up against, even more in my second book (as yet untitled and not quite finished) than in the first one.