We already knew that Sony would be enabling M.2 SSD expansion on the PS5 via a future software update, but that is also the case for variable refresh rate (VRR) support. Sony is yet to confirm when either functionality will arrive, though.
https://www.notebookcheck.net/Sony-will-add-VRR-support-to-the-PS5-but-it-refuses-to-say-when.505716.0.html