We look forward to a translation, though this Supreme Mahasiddha with undefiled commitments has already written and given oral pointing out instructions on the subject. The books Clear Light of Bliss, Mahamudra Tantra, and Modern Buddhism contain this material. However, he is always releasing material with new presentations that contain profound blessings to connect through it.
As a side note, people may be interested to know that in Kachen Yeshe Gyaltsen's commentary to Lama Chopa translated as Manjushri's Innermost Secret, Lotsawa David Gonsalez Losang Tsering included a translation of the Panchen Lama Losang Chokyi Gyaltsen's Mahamudra text entitled "The Main Path of the Conquerors". This is available from Dechen Ling Press. As for the Lama Chopa commentary, I could never praise it highly enough!
It appears to principally be a commentary on Sutra Mahamudra. In the books by Supreme Siddha Kelsang Gyatso Rinpoche, he explains Mahamudra from the point of view of both Sutra and Tantra and reveals special oral instructions such as the 6 stations, and meditation on the nature of mind from the point of view of completion stage.
Now if we could only generate bodhichitta and meditate on that stuff everyday!