Well not just Lutheran but ... it seems to me that the Lutheran Book of Concord and the official documents of the LCMS synod are analogous to the Catechisms, Ecclesiastical writings etc. of Verbum. I would like to see Logos aggressive pursue the church documents of other major denominations and allow users to set the denomination of their choice which would autogenerate collections for church fathers, doctrinal (catechism) text, church documents, "major figures". These collections would automatically appear in the Passage Guide, Topic Guide and be available for searches.
I also think it could be used as a major selling point in seminaries.