Until that time, gaming cards will be the card of choice I believe simply due to their scrap value being taken into account when calculating lifetime ROI
Perhaps another point to add that would be desirable: compact size. The smaller the card the smaller the rig and the smaller the rig the more rigs one can fit into the space - thereby reducing the space a farm takes up (heat dissipation of course would need to remain unaffected.......)
The new mining specific GPUs are said to be 2x faster in mining for ethereum almost 60 MH/s for $350
https://hothardware.com/news/nvidia-allegedly-readying-pascal-crypto-mining-gpus-ethereum-bitcoin
Hmm, the 1080 variant is stock clocks, I don't see it doing more than 25MH, certainly no more than 30MH/s for Eth. The 8x rig in the slide listed at the bottom is doing 200 with 8 cards which is 25MH/sec per card.
My $0.02 says there just isn't going to be a substantial change in hashrate on any of these cards, provided they even exist. Like the OP I wouldn't be buying them anyway, as I may game with one or resell it at some point.
I read they won't just retail these to anyone either, that they would be going out in large quantities only. This also seems...odd.