AMD's semi-custom chipset technologies for Microsoft, Sony, and even Intel may be becoming too lucrative to ignore. If rumors are true, then the AMD Navi series will not be competing in the flagship space against the impending Nvidia Turing GTX 1180 or 2080 due to development commitments with Sony.
https://www.notebookcheck.net/Sony-Playstation-5-getting-thrown-under-the-bus-for-poorly-received-Radeon-RX-Vega-series.309004.0.html