'Wu said tests have shown that the chip can achieve an energy/hash ratio of 42J/TH'

The 13.5 S9 was using 0.098W/GH, meaning 98J/TH. This is potentially 2.3 X more efficient. So it's capable of around 31TH using the APW3++ at around 1400W?

But they won't max it out to start with, they'd want to bring out newer, improved versions later on, so perhaps 28TH @ 1,350W?