Re: ANTMINER S7 is available at bitmaintech.com with 4.86TH/s, 0.25J/GH
Bitfury makes their miners for data centers. Almost no one in US can use those miners because of the power draw, just like the S5+. That is why I like Bitmain so much, they create miners that the home user can actually run. To bad Bitfury does not make two different models, one for home users and one for data centers. Competition makes companies improve faster and reduces prices for public 
You can buy into their data center if you can afford to buy 1 PH. I'm guessing it would cost you $500,000 for 1 PH for 1 yr ?. Then you 're likely stuck with not be able to switch pools...albeit their pool has been rocking lately. My gut tells me that, given their amazing jump in finding blocks, has been due to their new chip .So, I think they have been running their new rigs for at least a month...but what do i know.
EDIT: I think we will see a lot of older miners continuing to come offline soon. So I don't think diff will increase massively as more new efficient miners come online....maybe 3% a month?? But again, what do i know.