Looks like we'll see some great future installments to go along with the guides authored by the professors over at Civil Warriors. Clearly, the success of the 'big-name battle' guides by Woodworth, Grimsley, and Simpson has paved the way for a welcome branching out by the series into more uncharted territory.
Wilson's Creek, Pea Ridge, and Prairie Grove: A Battlefield Guide, with a Section on the Wire Road is certainly created by the right guys (Earl J. Hess, Richard W. Hatcher III, William Garrett Piston, and William L. Shea). The publisher only gives "when it's available" as a release date, but the Camp Pope Bookshop's "What's New" page has it slated for December 2006.
I am similarly pleased to see a Peninsula Campaign guide authored by Brian Burton in the pipeline. We'll have to wait for 2007 to see The Peninsula and Seven Days: A Battlefield Guide, but I like the direction the series is taking.