For those of you who are interested in "The Petersburg Campaign" by Edwin C. Bearss and Bryce A. Suderow, here is some new information.
One of the staff for Savas-Beatie is indexing volume 1. This will take 2 or 3 weeks I am told. After that the book goes to the publisher. That will take 3 or 4 weeks, I hear. So it seems the book will appear in September.