A picture of a prototype Samsung Galaxy S10 Plus codenamed 'Beyond 2' has leaked online and it seems to confirm the presence of the dual in-display selfie cameras as was speculated in earlier leaks and renders. The leaked image shows the device covered by an anti-leak screen protector but we can still observe the top and bottom bezels to a fair extent.
https://www.notebookcheck.net/Leaked-picture-of-the-Samsung-Galaxy-S10-Plus-Beyond-2-prototype-confirms-dual-in-display-front-cameras.376186.0.html