The D3 already eats 1200Watt.
In case they double the Asic-chips on that guy (thats how the L3+ was born) it will eat 2400 Watts.
Assuming they just double the ASIC-chips and size of D3, you have a franken-ASIC.
So the next possibility: bitmain has a more efficient ASIC-chip in their sleeves already.
If so, why did they release D3 at all ? If i read it correctly, bitmain has never done a NM-shrink so quickly.
All in all its not so likely for me. But who knows
time will tell
smaller chips
edit: they only liquidate their in house machines once they have more powerful stuff already in, and are clearing up rack space. If they're selling 15gh, they're running 30ghs already. If they sell 30ghs, use your imagination.
Another reason is once they clear an entire production line of a miner, and the profitability is rock bottom, people stop buying. They'll stop selling. At that point, they can liquidate hashed coins (by the millions) into bitcoin or fiat. Either for further investment into the company, or for pay-outs.
No hardware to sell, no reason to hold back & prop up the coin.
In the case of the L3 / L3 + the reason they could double it was because the L3 was using around 400 watts. Going from 400 to 800 watts with double power was easy.
However, the D3 already uses 1200 watts. If they doubled it, that would be 2400 watts in a unit which is unfeasible. They could probably develop the chips, but then that takes time too, much longer than you would expect.
Also, based on previous history, we should have an L3++ at 1200 watts or 750 gh/s but I do not see that yet.