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Almost nirvana...
The dark signal is 0.4 e-/sec at -20C, so the read noise problem has been replaced by a dark noise problem. This is okay for the intended market (microscopy mostly) where a 2-3 sec exposure is a long time to have to wait, and too long if you are studying dynamics.
But they don't have far to go, dropping the dark signal by a factor of ~10 would probably be enough to be read noise limited again. I wonder what the dark signal halving temperature is on these devices. Might be reachable in cooler climates.
EB
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