A reader pointed out a forthcoming book on union with Christ: One with Christ: An Evangelical Theology of Salvation. This 256–page book by Marcus Peter Johnson is supposed to be published by Crossway on August 31, 2013.
Here’s the description from Amazon:
Regeneration, justification, sanctification. These are the primary words that come to mind when talking about the theology of salvation. However, the Bible teaches that each of these concepts is firmly rooted in something more foundational: our union with Christ. In this accessible book, Johnson introduces us to this neglected doctrine, arguing that it is the dominant organizing concept for salvation in the New Testament. In eight thought-provoking chapters, Johnson shows how a believer’s position “in Christ” is the lens through which other all other facets of salvation should be understood. Interacting extensively with the biblical text and drawing on lessons from church history, Johnson presents a compelling case for the unique importance of this beautiful, biblical doctrine.