What is the probability that they will have a release of these on Hashnest?
Quite low and if it ever does come out expect em to be incredibly overpriced like the L3+. They have no reason to put them up and if they do expect prices to be jacked up to $6k+ per miner. More likely is they mine with the miners themselves. That being said Bitmain always gets around to listing their miners on Hashnest, albeit at exorbitant costs.
I got my L3+ in May when they were offering for 1,200 for July hardware shipment or 1,800 on hashnest, hashing immediately. I opted for 1,800 and made double before the July shipments even got into the hands of people.
So if the D3 comes on Hashnest within the next few weeks for 3-4k. I am jumping on it.