wireplumber 0.5.3 offers native support for the L5 and original Pinephone cameras, meaning that apps can now leverage the camera for tasks such as QR code scanning, more camera app options, etc. This will trickle down to PureOS/Mobian/PostmarketOS.
I’m speculating here, but I’d assume crimson and/or dawn. byzantium is only receiving enough developer attention to receive kernel/security updates at this point, since the focus is on crimson.