Obviously, attention surrounding the Civil War Sesquicentennial provides a good opportunity for publishers to schedule new campaign and battle history releases for their corresponding war year. I'll admit to being quite disappointed that no serious First Bull Run monograph, among other things, emerged last year, but let's see what 2012 might and might not bring.
It would probably be unnecessary to attempt to supplant Rick Sauers's history of Burnside's NC expedition, Hennessy's 2nd Bull Run classic [although Scott Patchan contributed an excellent supplement in '11], or the Noe & Hafendorfer and O'Reilly & Rable double teamings of Perryville and Fredericksburg. I am also more than satisfied with what we already have for Forts Henry & Donelson, Pea Ridge, Island No. 10, the Shenandoah, Cedar Mountain, Iuka & Corinth, Prairie Grove, and Stones River.
I've yet to hear even a rumor of anyone working on a new history of the fall of New Orleans, or anything from 1862 Trans-Mississippi operations. A Seven Days overview is scheduled for this year, but no news obtainable by me is currently available for any of the Peninsula battle histories that are supposedly in process. Brian Jordan's South Mountain book should be something to look forward to, along with the Antietam campaign atlas from the same publisher, but I have no idea if Scott Hartwig's first of two Maryland campaign volumes is expected in 2012. Given the neglect by all Shiloh histories of a rendering of second day events comparable in detail to the first, there is still ample room for a definitive Shiloh battle history. Unfortunately, with Peter Cozzens giving up the attempt, and the 2012 Woodworth and Groom books not of the sort, it appears the opportunity will be lost. If Timothy Smith covers the "siege" in some detail, the freshest entry of the year might very well be his book length examination of Corinth's military role in the war. A new examination of the 1862 portion of the Vicksburg campaign [Sherman's riverine right hook to Chickasaw Bayou and Grant's overland advance] does not appear to be on the horizon.
Of course, 2012 has only just begun and all of this may change when the Fall '12 catalogs come out this summer.