I will be optimistic and say that Neptune will be 5TH/s.
For 0.10BTC a day we need a difficulty of 25 billion.
25 billion difficulty = 179PH/s = 35800 Neptunes.
With batches of 1200 that seems highly unlikely even with all the competition around.
I wouldn't count on Neptunes being 5 TH/s. Cooling that beast would be crazy.
I wouldn't count on HashFast not shipping. And Cointerra not shipping. And Black Arrow not shipping. And BitMine not shipping. And BFL not ship...wait, you can count on BFL not shipping.
If hashing power is increased too much some people won't even be able to turn them on because of power consumption.