Radeon driver code for Navi has been spotted that appears to confirm the upcoming graphics solution from AMD will be based on the Graphics Core Next (GCN) microarchitecture. There was still some speculation that Navi might feature next-generation architecture that had been mentioned on AMD's graphics roadmap but that seems highly unlikely now.
https://www.notebookcheck.net/Driver-code-confirms-AMD-s-Navi-GPU-series-will-be-based-on-Graphics-Core-Next.419679.0.html
It still looks like AMD may well beat Nv in having 7nm and HDMI 2.1 in their GPU's. They will already beat Intel to pci-e 4.0 in their chipsets. Not a bad turn of events right?