AMD won't be releasing any new desktop GPU's this year. So, don't worry about this rumor. Lets say that magically in unicorn land this rumor was true, it would still be at least one month for AMD to officially announce these cards, at least 3-4 weeks for the reviews to come out and then usually at least 2 weeks before the cards have a paper launch, probably good 1 months after their initial sale day for availability and probably with a bit of an inflated price.
So at the earliest you are looking at a 3 months wait for a much more expensive graphic card and low availability.
So just get that 580 8gb and be happy with it.
No reason to expect they would do a paper launch, because they haven't done that in what, 2 generations now? They have been known to come out of nowhere with this stuff, as well, so I wouldn't be so certain that they won't have something with Polaris coming out.
Not that I think that they will, really. Except that they still have to fulfill orders with GloFo (not that the newest details are actually known), but they obviously need to be giving them some work through whatever agreement will be revised. The bulk of Zen is now at TSMC as they move towards 7nm, and that is certainly their focus going forward with Epyc, because that is absolutely poised to dominate that market in the next year or two. Few really doubt that, so it's pretty easy to see that this is where they are going....which puts some doubt on their GPU plans and space. But, they need to fulfill some 12nm orders for sure. This will leave low-end Zen and new "Athlon" cores, and even current Ryzen 2 chips that are still selling pretty well, I think. This is probably where they would be putting Polaris if they want to release something in a value segment, just to get something out there, but I'm honestly not sure what they hope to do there.
That process hasn't really been great for Polaris and it's been pretty terrible for Vega (these are still pretty good cards, but they are absolutely inefficient compared to what TSMC was doing on 14nm). I'm not sure if it is really worth it to them to release something in that "between 580 and 1070" range of performance, that is almost certainly not going to be as efficient as 1070 for the same overall performance.
7nm is the only thing that could make things interesting with their current Vega or even Polaris architecture, but I can't see that being anything but Rome and Zen 2 going forward throughout 2019. I think Navi is now 2020, maybe? That is likely where we are going to see their first 7nm GPU. ...could be wrong of course, Vega would probably quite awesome at 7nm, but I just don't imagine AMD sees any real value in that right now, when they have a very strange, and unanticipated chance to grab Intel by the throat with Rome and Zen 2.
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