Dont thing so, GTX 1060 will come later this year with performance of GTX 970/980 at 100-120W TDP and $200-250 price point.
I will say it once more, if Polaris 10 is R9 390X with 150W TDP it will be a huge fail.
For that performance, it won't be a 150watt card those, I would think more along the lines of 120watts. This would make it more accessible to people that have a 300watt power supply.
However it would indeed need a max 280 dollar price to sell and at that price, it would not be flying off the shelves.
The gtx 970 kind of saturated sales for people that wanted this level of performance, particularly the overclocked ones for the last year and a half. This means although it might give AMD some marketshare because of volume, the revenue will just be so so because for this card to be particularly successful, the volume needs to be really high and because so many cards provided this role for the last 22 months, the amount of buyers left is not ideal for AMD. Add in competition from the 1070, the used card market and such, and the biggest customers for AMD at this point are the OEMs.
Cards often good for system builders are often terrible products for OEMs. This is beause they are either too expensive or they use too much power. For Nvidia's consumer lines, only the gtx 970 and below are suitable for most OEM's. However for system builders, these products are the least desirable as we want more power and performance regardless of cost to a certain extent. Polaris 10 fit in the OEM's category which means it was never going to be terrible exciting for us, however for OEM's it's the most attractive product from AMD in a very long time.
Tonga, Fury X and hawaii, were unsellable to OEMS because of their poor performance per watt and Tonga was just too slow that most companies just picked a gtx 960 or 970.
The 480/480x will atleast be sellable to these companies which is one of the biggest things AMD needs right now. Basically maximum performance at 120 watts, at an affordable price.