The PS5 will supposedly be almost twice the thickness of a PlayStation 4 Pro and has a design that is completely different to everything that has been predicted so far according to a Sony "insider". Sega may be planning a new console release or might team up with Microsoft in Japan for a "Sega Series X".
https://www.notebookcheck.net/Next-gen-console-rumors-PS5-will-be-twice-as-thick-as-the-PS4-Pro-huge-Sega-scoop-could-point-to-a-new-console-or-even-a-Microsoft-team-up-for-a-Sega-Series-X.467526.0.html