No, I don't believe any further volumes of His Grace's series from SVS Press have been published. With his duties as co-chair of the international Orthodox-Anglican dialogue, being a member of the international Orthodox-Catholic dialogue, and other speaking engagements and writing commitments since his "retirement" from teaching at Oxford, His Grace has not found the time to finish any further of these books. I do know he's working on them, so hopefully they will appear in the not-too-distant future.
But I have recorded him giving several series of lectures for OLTV which are available as CD or DVD packages:
Mystical Theology of the Fathers (10 lectures)
Heaven on Earth: Inner Meaning of the Eucharist (6 lectures)
Ecumenical Reflections: OL Conference talks (8 lectures)
Our Lenten Journey: Talks around Washington 2010 (6 lectures)
Mystery of the Church: Orthodox Ecclesiology (6 lectures)
Doctrine of the Holy Trinity (7 lectures)
Each lecture is 40-45 minutes long and most were recorded in his home library/study in Oxford. You can order online at www.olconference.com
, Online Catalog, Adult Enrichment series.