If you buy Cyberpunk 2077 for PlayStation 4 or Xbox One and later invest in PlayStation 5 or Xbox Series S / X, you can continue your adventure by moving the save files. About the official of the game Twitter account explained how this works:
PlayStation 4 to PlayStation 5 (3 options)
1. Log in with your PlayStation Plus account and upload your files to the cloud or,
2. Transfer the save files via LAN cable or wireless connection (WiFi) or,
Use a compatible storage device to copy and move the files to the same PSN account on PlayStation 5
Xbox One to Xbox series
Make sure you are connected to the Internet to upload the files to the cloud or connect your Xbox One and Xbox Series console to the same network and use the System Network Transfer feature.
Cyberpunk 2077 will be released on December 10 for PC, PlayStation 4, Stadia and Xbox One.