The following editions are in the course of preparation:

The Marginalia of the Old English Bede
Dr Jesse Billett has prepared an edition of the liturgical texts added to the margins of Cambridge, Corpus Christi College MS 41, a manuscript discussed in detail in his monograph, The Divine Office in Anglo-Saxon England, published in HBS subsidia.

English Benedictine Kalendars post 1100, vol. 3: Kalendars of Male Houses, Norwich-York
Professor Nigel Morgan is well advanced in the preparation of this volume, which will at last complete the work begun by Francis Wormald with vols. LXXVII and LXXXI.

The Libellus Precum of Sigebert of Minden (Wolfenbüttel HAB Cod. Helmst. 1151).
Edited by Dr Joanne Pierce.

Two English Coronation Ordines
Edited by Dr David Pratt.

Carolingian Mass Chant Books
Edited by Dr Daniel DiCenso.