1. Civil War Wests: Testing the Limits of the United States edited by Adam Arenson and Andrew R. Graybill (Univ of Calif Pr, 2015).
They came in at the tail end of the Sesquicentennial but it's nice to see a couple essay collections [this one and Empire and Liberty] with significant Far West components. Civil War Wests examines a wide variety of Civil War and Reconstruction subjects with a geographical scope stretching from Missouri to the Pacific Northwest and down through the desert southwest.
2. Spring 1865: The Closing Campaigns of the Civil War by Perry D. Jamieson (Univ of Neb Pr, 2015).
I believe it's been a long while since the last Great Campaigns of the Civil War series title appeared. This study integrates all three major theaters into its military and politically oriented retelling of the war's concluding events.