1. Robert E. Lee At War: The Mind and Method of a Great American Soldier, Volume One: Tragic Secessionist by Scott Bowden (Military History Press, 2012).
This is the first of an 8-volume(!) military biography of Lee. The publisher has more information here. They also have a sample chapter. MHP pulled out all the stops on materials and presentation (it even has a ribbon marker). I am not familiar with Bowden's existing Lee scholarship, not having read his earlier Gettysburg book Last Chance for Victory.
2. So You Think You Know Antietam? The Stories Behind America's Bloodiest Day by James and Suzanne Gindlesperger (John F. Blair, Pub., 2012).
The Antietam companion to the pair's So You Think You Know Gettysburg? Intended primarily for a "casual" audience, the guidebook offers Antietam trivia and stories, and features the battlefield's 96 monuments. It has 300 color photos, as well as maps and GPS data for visitors.
3. Thomas J. Wood: A Biography of the Union General in the Civil War by Dan Lee (McFarland, 2012).
According to the back cover, this is the first biography of Wood, the Union general best known for the creation of the catastrophic gap in the federal lines through which the Confederates poured on the second day of Chickamauga.