I'm expecting to see the S7 somewhere around 0.4w/gh efficiency. If they keep the same PCB layout and number of chips I'd figure they'd be hitting around 1.35-1.4TH/s for about the same power draw, basically just upping the efficiency by 20%. I expect the price to be over $400 when released, just like the S5 was when it was first released.
If they don't beat those numbers by a larger margin, I honestly don't see mass sales. Anyone with >0.7w/gh and expensive power I could see them pulling the trigger and doing an upgrade, but I really can't see many with S5's feeling the need to immediately upgrade, even those with not great power costs. Those with free or cheap power it doesn't make much sense to upgrade anything newer than an S4 I would think (unless the price is, as you hoped, halved).
I Hope the S7 is Quiet like the Avalon 4.1s
i can barely hear my s3s.. i think they screwed up on the s5. the BM1384 has so much potential. if they took the time to engineer something for it, it could have been twice as efficient and probably just as quiet as the s3.
i hope someone finds a way to undervolt them and get them to run at .3/ghs like they said they could, the chart is still on the first page even.