The most awaited book in Pauline scholarship is surely now Beverly Gaventa's commentary on Romans. Later this year she publishes When in Romans: An Invitation to the Linger with the Gospel According to Paul, which will accompany her early Our Saint Paul and get us closer to the final commentary appearing. This new book will probably collect her essays on various texts and issues in Romans over the last few years.
Douglas A. Campbell is working on a new book, which might see the light of day before 2016 is finished. This new book is an attempt to set out Paul's theology as he reads it and in a style that will reach a wider audience than The Deliverance of God.
In 2014 at SBL, Ben Blackwell and others organised a set of papers on Paul and Apocalyptic, and they will be published this year as Paul and the Apocalyptic Imagination.
NT Wright never has a year off and before the end of the year he will have published The Day the Revolution Began: Reconsidering the Meaning of Jesus' Crucifixion, which sounds another addition to his 'series' of studies that include Surprised By Hope, Virtue Reborn and How God Became King.
Richard Hays, who underwent treatment for cancer last year, is scheduled to publish Echoes of Scripture in the Gospels this year. It is a sequel of sorts to Echoes of Scripture in the Letters of Paul and is the fuller version of the shorter Reading Backwards that came out in 2014.
Outside of biblical scholarship, fans of Rowan Williams will be able to enjoy a collection of essays On Augustine, although I'm more interested in Being Disciples, a sequel to his excellent Being Christian.
Robert Jenson has new introduction to theology A Theology in Outline: Can these Dry Bones Live? (Oxford), based on the set lectures he used to delivered to undergraduates at Princeton.
Baptists should be looking forward to Steven Harmon's Baptist Identity and the Ecumenical Future (Baylor) and the third volume of James McClendon's Collected Works (also Baylor). This final volume will be a collection of sermons.
James K. A. Smith is publishing You Are What You Love: The Spiritual Power of Habit (Baker) which will pick up themes from Desiring the Kingdom and work them for a wider audience.
As the likes of Sarah Coakley and Katherine Sonderegger are working on systematic theologies (first volumes already out), Graham Ward publishes How the Light Gets in: Ethical Life (Oxford), which is the first in a four-volume project systematic theology.
Also to look forward to is a new book from John Flett: Apostolicity: The Ecumenical Question in World Christian Perspective (IVP) and Alan Kreider on the growth of the early church in The Patient Ferment of the Early Church: The Improbable Rise of Christianity in the Roman Empire (Baker)