A recent Savas Beatie newsletter mentioned in the "under contract" section that they will be publishing Clint Crowe's Caught in the Maelstrom: The Indian Nations in the Civil War, 1861-1865, a project based on the author's dissertation. The study will center on the Civil War experiences of the Five "Civilized" Nations that were settled in Indian Territory during the antebellum period. Follow the link above to read the book description [I would make one significant correction to it, though, with the Seminoles providing soldiers to both sides, not just the Union forces. Call it getting right with John Jumper]. I don't expect the book to actually be released next year but will keep an eye out on its progress. A modern, full-length study of this kind has been long overdue.
On a related note, next week I will be posting my Q&A with Jane Johansson. It will discuss her new book, the edited writings of officer Albert Ellithorpe of the First Indian Home Guard.