Fairphone has sent me an e-mail stating that they will upgrade the camera through a system update for better usage, e.g.
Faster shots, better low-light shots, smoother video stabilization; your Fairphone 4 shoots more professional than ever. What are you waiting for, it’s time for an update.
I guess @qoheniac was referring to the “sent me an e-mail” part … there’s a blog post about what the camera email was talking about, unrelated to /e/OS.
For the time being, no one should expect Fairphone’s camera update to become available directly in /e/OS. From all I know the camera app in all /e/OS versions (regardless of device, with potentially just Murena’s own hardware excempted, but I simply don’t know) is a fork of Open Camera and not any device-specific camera app.