An intersting spot, in a recent AMD investor presentation of August 2016 there is a mention of 'Vega' for the enthusiast market in the slides, with a launch date set at 1H 2017. That could be Vega 11.

1H 2017 would mean first half of 2017. Now we know there will be multiple Vega (Vega 10 and Vega 11) based products so that is an interesting spot alright as AMD originally was supposed to launch their high-end class VEGA (codename) product in early 2017, as it now seems that launch is being moved forward towards October. 

"Vega10" is lined up to replace the 390/490 series. "Vega11" will replace the FIJI / Fury parts. Rumors right now indicate that Vega10 has 4096 stream processors and could compete with the GeForce GTX 1080 and GTX 1070. Vega11 (thus that launches 2017 1H would feature 6144 stream processors and would be lined against the GP100 big pascal GPU (think Titan).
  

 
The new info on VEGA 11 can be spotted in this presentation.

AMD decided to pull the launch of its next big silicon, Vega10 from early-2017 launch to October 2016 (that is still a rumor though). Vega10 would be the GPU that replaces the Hawaii/Grenada series, perhaps with GDDR5X memory ? If so, Vega11 could be the enthusiast class HBM2 memory product that releases in 2017.