The Finns have published a joint volume on various aspects of Luther’s theology. It is entitled Engaging Luther – A (New) Theological Assessment and edited by Olli-Pekka Vainio. Quotation from the book description:
The volume consists of articles written by scholars affiliated with the project known as “the New Finnish Interpretation of Luther.” The topics include Luther’s theological anthropology, Trinity, christology, sacraments, faith, theology of the cross, the Virgin Mary, sexuality, music, and the spiritual reading of the Holy Scriptures.
More on the volume from the publisher’s website: http://wipfandstock.com/store/Engaging_Luther_A_New_Theological_Assessment/