AMD Polaris will have:
Polaris 10 rumored performance to be "around" 980 Ti performance for only $300-400. 175W TDP. Revealed end of May.
http://www.tweaktown.com/news/51814/amd-polaris-10-gpu-performs-close-to-nvidia-geforce-gtx-980-ti/index.html http://wccftech.com/amd-polaris-10-desktop-polaris-11-notebook-gpu/
As I understand Polaris will be available for notes first and desktop will be only late 2016 early 2017.
Also remember that AMD almost always use marketing tricks, like telling you one test result where its product perform good and not telling about all other.
The latest info seems to indicate that they're on track for an initial roll out before back-to-school buying kicks in (July-August). This includes the new desktop enthusiast card (480/490 class) and higher-end mobile gaming chipsets. So possibly as early as late June. This will be followed up by a low-power mobile chip & value desktop card (Polaris 11) expected for this fall. Vega will kick in first half of 2017 with the HBM2 memory which will most likely be a Fury class replacement designed for bragging rights at highest possible price.
AMD livestream at Computex, 10:00 PM EST tonight -
http://videocardz.com/60686/watch-amd-computex-polaris-update-live-stream-here
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