Someone measured Z9 at about 380w at 15k, I did not, but mine runs at 54C, fan at 65%. So minimal heat or noise. And at current profit level power is pretty immaterial. It will become an issue much later in life, by then most coins may have already forked.
Edit: And there will be only a week's head start at max, I think, as Bitmain should be shipping rest very soon.
I have a hard time believing that a 50+% stable overclock results in only 380w @ the wall. That can't be good for the failure rate. You can't overlock inno miners, but they do release firmware updates. The A9 website says ±6%. The Z9 minis variance was ±5 when announced. What's to say that the A9 doesn't have a lot more to give if Inno allows it?
The absolute soonest bitmain could start shipping these miners is on the 18th. The first few days of shipments would likely be the day 1-3 customers anyways. Realistically people who didn't order in the first few days won't see their miners for 2 weeks at the
earliest. 3 weeks is a lot more likely. Their official shipping schedule is from june 20-30th. I'm guessing 1000 units a day which would confirm the rumors of a 10k units in batch 1.