Arthur H. Clark
Mormon Convert, Mormon Defector: A Scottish Immigrant in the American West, 1848-1861 by Polly Aird
The Nauvoo Legion in Illinois by Richard E. Bennett, et al. (Forthcoming May 2010)
Gettysburg to Great Salt Lake: George R. Maxwell, Civil War Hero and Federal Marshall Among the Mormons by John Gary Maxwell (Forthcoming April 2010)
Bill MacKinnon mentioned that At Sword's Point, Part 2 will be completed in 2010, but likely not published until 2011.
BYU Religious Studies Center
Days Never to be Forgotten: Oliver Cowdery, edited by Alexander Baugh
Champion of Liberty: John Taylor, edited by Mary Jane Woodger
The Colonia Juarez Temple: A Prophet's Inspiration by Richard O. Cowan and Virginia Hatch Romney
In Harm's Way: East German Latter-day Saints in World Ward II by Roger P. Minert (Forthcoming) Recently released
BYU Studies
Eliza R. Snow: The Complete Poetry, edited by Jill Derr and Karen Lynn Davidson (see notes from the ERS: TCP event)
Wayward Saints: The Social and Religious Protests of the Godbeites against Brigham Young (Reprint), by Ronald W. Walker
The Best of the Frontier Guardian, edited by Susan Easton Black (see this review)
Mountain Meadows Massacre: The Andrew Jensen and David H. Morris Collections, edited by Richard E. Turley and Ronald W. Walker
Oxford University Press
The Book of Mormon: A Very Short Introduction by Terryl Givens
Understanding the Book of Mormon: A Reader's Guide by Grant Hardy (Forthcoming March 2010)
Additionally, Matt Grow and Terryl Givens are working on a biography of Parley P. Pratt entitled Parley Parker Pratt: The St. Paul of Mormonism. It has been projected for late 2010, but it may end up being a 2011 production.
Utah State University Press
Utah in the Twentieth Century, edited by Brian Q. Cannon and Jessie Embry
The Mormon Passage of George D. Watt: First British Convert, Scribe for Zion, by Ronald G. Watt (Forthcoming 2009)
Post Manifesto Polygamy: The 1899-1904 Correspondence of Helen, Owen and Avery Woodruff, edited by Lu Ann Faylor Snyder and Phillip A. Snyder
Peculiar Portrayals: Mormons on the Page, Stage, and Screen, edited by Mark T. Decker and Michael Austin (Forthcoming May 2010)
Paul Reeve and Mike van Wagenen, eds., Between Pulpit and Pew: Mormon Encounters with the Paranormal (Forthcoming 2010)
Signature Books
New Mormon Studies CD-ROM, 2009 Edition (Forthcoming)
Smith-Pettit
The Complete Brigham Young Discourses, 5 Volumes, Edited by Richard Van Wagoner
ABC-CLIO
Mormonism: A Historical Encyclopedia, edited by W. Paul Reeve and Ardis Parshall (Forthcoming)
Harvard University Press
On Zion's Mount: Mormons, Indians, and the American Landscape (Paperback Edition) by Jared Farmer (Forthcoming April 2010)
Cedar Fort, Inc. (I cannot vouch for the quality of these publications, but I've listed them here just FYI)
Far West, Missouri: It Shall Be Called Most Holy by Janet and Dan Lisonbee (Forthcoming 2010)
Bodyguard to the Prophet by Larry Mullins (Forthcoming 2010)
Mere Mormonism: Defense of Mormon Theology by Ronald Zollinger (Forthcoming 2010)
The University of Nebraska Press
Excavating Nauvoo: The Mormons and the Rise of Historical Archaeology in America by Benjamin Pykles (See also Page 47 of the UNP Catalog) (Forthcoming)
The University of Missouri Press
The Missouri Mormon Experience, Edited by Thomas M. Spencer (Forthcoming)
Shadow Mountain
Kiss it Goodbye: The Mystery, the Mormon, and the Moral of the 1960 Pittsburgh Pirates by John Moody (Forthcoming)
Greg Kofford Books
-Hearken O Ye People: The Historical Setting of Joseph Smith's Ohio Revelations by Mark L. Staker
-A reprint of Andrew Jenson's LDS Biographical Encyclopedia (still forthcoming)
- The Development of Mormon Theology by Charles Harrell (forthcoming)
University of Utah Press
Amasa Mason Lyman: Mormon Apostle and Apostate, A Study in Dedication by Edward Leo Lyman
At Rest in Zion: The Archaeology of Salt Lake City's First Pioneer Cemetery by Shane A. Baker (Forthcoming February 2010)
Early Mormon Missionary Activities in Japan, 1901-1924 by Reid L. Neilson (Forthcoming 2009)
Mormons as Citizens of a Communist State: A Documentary History of the Church of Jesus Christ of Latter-day Saints in East Germany, 1945-1990 by Raymond Kuehne (Forthcoming 2009)
On The Mormon Frontier: The Diary of Hosea Stout, 1844-1889 (Paperback edition) edited by Juanita Brooks
The Autobiography of Hosea Stout edited by Reed A. Stout, Revised by Stephen L. Prince
The Church Historian's Press
The Joseph Smith Papers, Revelations and Translations (Facsimile Edition)
The Joseph Smith Papers, Documents, Volume 1 (Forthcoming, 2010) [The JSP website says these two books are forthcoming in 2010, though I've heard from other sources that this may be optimistic with the History volume being more likely to arrive in 2010]
The Joseph Smith Papers, History, Volume 1 (Forthcoming, 2010)
Yale University Press
The Book of Mormon: The Earliest Text, edited by Royal Skousen
"Liberty to the Downtrodden" Thomas L. Kane, Romantic Reformer by Matt Grow
John Whitmer Books
Strangites: The Great Lakes Mormon Experience, edited by John Hamer and Vickie Speek (Forthcoming)
Lost Apostles: Forgotten Members of Mormonism's Original Quorum of the Twelve, edited by William Shepard and H. Michael Marquardt (Forthcoming)
An Illustrated History of Nauvoo by Steve Shields (Forthcoming)
Let Contention Cease: The Dynamics of Dissent in the Reorganized Latter-day Saint Tradition by W. B. Spillman (Forthcoming)
I know that a volume of collected essays on polygamy is in the works, as well as Hanging by a Thread: Joseph Smith and the White Horse Prophecy by Newell G. Bringhurst and Craig L. Foster.
FARMS/Maxwell Institute
One Eternal Round by Hugh Nibley (Forthcoming, 2010–It has been said that release of this book will coincide with Nibley's 100th birthday)
Analysis of Textual Variants of the Book of Mormon, Volume 6 by Royal Skousen
The Mormon Tabernacle Choir
The Building of the Schoenstein Organ at the Conference Center of the Church of Jesus Christ of Latter-day Saints, Salt Lake City, Utah by John Longhurst
Millennial Press
When the Saints Came Marching In: A History of the Latter-day Saints in St. Louis by Fred Woods and Thomas Farmer
Southern Utah University Press
"I Would to God:" A Personal History of Isaac Haight by Caroline Woolley.
Globe Pequot Press
Pioneer, Polygamist, Politician: The Life of Dr. Martha Hughes Cannon by Mari Grana
Eborn Books
A History of the B. H. Roberts Family by Richard C. Roberts
Eborn Books will also publish the newest found manuscript of William E. McLellin with Harvard Heath as editor, though I do not have any info on timetable. Also on deck is the Lorenzo Snow Prison diary and also I've heard of a Wilford Woodruff autobiography that Eborn is hoping to publish. There is one other manuscript in the works, but the editor chosen not to make it public yet, so I'll wait until that's the case.
Digital Legend Press
Historia de los Santos de los Ultimos Dias en Bolivia by Nestor Curbelo
Routledge
Megan Sanborg Jones, Performing American Identity in Anti-Mormon Melodrama.