A patent attributed to the OEM Samsung has been posted online, showing a phone with a truncated display on its rear panel. The front of this device appears to lack cameras of any kind, suggesting that the secondary screen takes over in the event that the user wants a portrait shot. Otherwise, the device looks conventional in the extreme.
https://www.notebookcheck.net/Samsung-allegedly-patents-a-selfie-friendly-dual-display-phone.424707.0.html