I did a small, simple rudimentary calculation.

I'm a small-time cloudminer. (Really small-time.) I have 78 GH in Hashnest S7 power. Now here's what I see:

With antpool's current hashrate, in the last 3 blocks (the first 3 after the halving) I got paid BTC 0.00000294 per block. This breaks even on maintenance costs for my hashpower when a block takes about 60 minutes. Given the fact that on the current hashrate Antpool reveals a little over 30 blocks per 24 hours (consistently over the last 4 days), according to blockchain.info/pols, my preliminary conclusion is that mining using s7 on Hashnest is still profitable, albeit very marginal compared to what it used to be before the halving.

P.S. I believe this is not a function of the total hashrate, because if the hashrate drops, obviously the amount of blocks per day will drop as well, but the earnings per GH should increase proportionally, as there are less miners in the pool to share with. Obviously this changes when the difficulty increases, but given the fact that S7 miners are supposed to be amongst the most efficient ASICs, I really don't see how the difficulty would increase dramatically after the halving, as I believe a lot of miners will stop hashing.

I also remember reading rumours about the S9 getting into Hashnest early next week, but I can't find the reference. I believe it was somewhere on reddit. (I understand, as this is my first post on the forum, I don't have a lot of credibility to make a statement like this, but let's just say I am not associated with Bitmain/Hashnest in any way.)