My prediction is that 8 core Zen comes out in late 2017 (only a year late, pretty good for AMD) will match 4 core icelake, which intel brought out early because of how afraid they were of Zen. As long as we are making stuff up lets go with it.
If you want to make reasonable assumptions, I will be surprised if 8 core zen really does come out before early 2017, and I expect it to at best be competitive with hex core intel. And there is already a hex core intel under 400.00, and it will be more price competitive once DDR4 becomes mainstream.
And unless AMDs marketing is even more incompetent than generally assumed, *if* they can come out with an 8 core zen as fast as 8 core intel, they will be fools to price it at 200 or even 300 dollars. I dont think they would though, as the exorbitant price they tried to charge for the overclocked 8350, i.e. 9590, shows that AMD is equally willing to put the screws to the consumer as intel is accused of being if they have a product they think can back it up. Unfortunately for them the performance and power usage did not back it up, and they had to quickly back off on the price.