I find it very interesting that he says all his Dzogchen translations (four?) from the Dudjom Tersar will be published next year.
Wallace's translation of Dudjom Lingpa's "gnas lugs rang byung" [dag snang ye shes drva pa las gnas lugs rang byung gi rgyud rdo rje'i snying po]
will be one of the publications, finally. An unfinalized version of the translation has been circulating online for some years now, looking forward to this finalized version being available (the text requires a transmission no doubt, but nevertheless nice to see this coming out).
Wallace based his book "Stilling the Mind"
on the śamatha and vipaśyanā sections of this tantra. The tantra in its entirety includes the aforementioned preliminary practices along with rushan, tregchö, thögal and bardo instruction... essentially Dudjom Lingpa's A to Z on Dzogpa Chenpo.