Soundwave on 26 May 2016
Speaking of which ...
Looks like someone on NeoGaf and Beyond3D spotted the "SCORPIO" here
https://forum.beyond3d.com/posts/1916838
SCORPIO: A 36 core "research chip".
A 36 core Polaris would give you (whataya know) 6.187 TFLOPS.
It's all lining up now.