AMD CEO Lisa Su already expressed the intent to bring back high-end GPUs into the game in the Q3 financial report from last month, and now Su is reiterating these plans, saying that AMD is ready to dominate all GPU sectors once again. Navi would be AMD's answer to Nvidia's mid-range RTX 2070 cards, while Arcturus (expected in late 2019) would take on the RTX 2080 Ti and beyond.
https://www.notebookcheck.net/AMD-CEO-reaffirms-the-comeback-of-high-end-gaming-GPUs-in-2019.373966.0.html